B21C1/00	7	Manufacture of metal sheets, wire, rods, tubes or like semi-manufactured products by drawing	B21C1/00	B21C1/00		645
B21C1/003	8	{Drawing materials of special alloys so far as the composition of the alloy requires or permits special drawing methods or sequences}	B21C1/00	B21C1/00		582
B21C1/006	8	{using vibratory energy}	B21C1/00	B21C1/00		174
B21C1/02	8	Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums	B21C1/02	B21C1/02		1926
B21C1/04	9	with two or more dies operating in series	B21C1/04	B21C1/04		648
B21C1/06	10	in which the material slips on the drums	B21C1/06	B21C1/06		70
B21C1/08	10	in which the material does not slip on the drums	B21C1/08	B21C1/08		109
B21C1/10	11	with accumulation of material between consecutively-arranged dies	B21C1/10	B21C1/10		52
B21C1/12	9	Regulating or controlling speed of drawing drums, e.g. to influence tension; Drives; Stop or relief mechanisms	B21C1/12	B21C1/12		1006
B21C1/14	9	Drums, e.g. capstans; Connection of grippers thereto; Grippers specially adapted for drawing machines or apparatus of the drum type; Couplings specially adapted for these drums	B21C1/14	B21C1/14		712
B21C1/16	8	Metal drawing by machines or apparatus in which the drawing action is effected by means other than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, rods or tubes	B21C1/16	B21C1/16		336
B21C1/18	9	from stock of limited length (B21C1/22 takes precedence)	B21C1/18	B21C1/18		170
B21C1/20	9	from stock of essentially unlimited length (B21C1/22 takes precedence)	B21C1/20	B21C1/20		140
B21C1/22	9	specially adapted for making tubular articles (bending sheet metal into tubular form by drawing B21D5/10)	B21C1/22	B21C1/22		821
B21C1/24	10	by means of mandrels	B21C1/24	B21C1/24		640
B21C1/26	11	Push-bench drawing	B21C1/26	B21C1/26		329
B21C1/27	9	Carriages; Drives	B21C1/27	B21C1/27		58
B21C1/28	10	Carriages; Connections of grippers thereto; Grippers	B21C1/28	B21C1/28		547
B21C1/30	10	Drives, e.g. carriage-traversing mechanisms; Driving elements, e.g. drawing chains; Controlling the drive	B21C1/30	B21C1/30		539
B21C1/305	11	{Linear motor pulling devices}	B21C1/30	B21C1/30		38
B21C1/32	9	Feeding or discharging the material or mandrels	B21C1/32	B21C1/32		515
B21C1/34	9	Guiding or supporting the material or mandrels	B21C1/34	B21C1/34		338
B21C3/00	7	Profiling tools for metal drawing; Combinations of dies and mandrels for metal drawing	B21C3/00	B21C3/00		136
B21C3/02	8	Dies; Selection of material therefor; Cleaning thereof	B21C3/02	B21C3/02		971
B21C3/025	9	{comprising diamond parts}	B21C3/02	B21C3/02		151
B21C3/04	9	with non-adjustable section (B21C3/08 takes precedence)	B21C3/04	B21C3/04		269
B21C3/06	9	with adjustable section (B21C3/08 takes precedence)	B21C3/06	B21C3/06		237
B21C3/08	9	with section defined by rollers, balls, or the like	B21C3/08	B21C3/08		284
B21C3/10	9	with hydraulic forces acting immediately on work	B21C3/10	B21C3/10		24
B21C3/12	9	Die holders; Rotating dies	B21C3/12	B21C3/12		456
B21C3/14	10	Die holders combined with devices for guiding the drawing material or combined with devices for cooling, heating, or lubricating	B21C3/14	B21C3/14		539
B21C3/16	8	Mandrels; Mounting or adjusting same	B21C3/16	B21C3/16		357
B21C3/18	8	Making tools by operations not covered by a single other subclass; Repairing	B21C3/18	B21C3/18		279
B21C5/00	7	Pointing; Push-pointing	B21C5/00	B21C5/00		240
B21C5/003	8	{of hollow material, e.g. tube}	B21C5/00	B21C5/00		212
B21C5/006	8	{of solid material, e.g. wire or profiles}	B21C5/00	B21C5/00		141
B21C9/00	7	Cooling, heating or lubricating drawing material (B21C3/14 takes precedence)	B21C9/00	B21C9/00		2069
B21C9/02	8	Selection of compositions therefor	B21C9/02	B21C9/02		283
B21C19/00	7	Devices for straightening wire or like work combined with or specially adapted for use in connection with drawing or winding machines or apparatus	B21C19/00	B21C19/00		467
B21C23/00	7	Extruding metal; Impact extrusion	B21C23/00	B21C23/00		392
B21C23/001	8	{to improve the material properties, e.g. lateral extrusion}	B21C23/00	B21C23/00		614
B21C23/002	8	{Extruding materials of special alloys so far as the composition of the alloy requires or permits special extruding methods of sequences}	B21C23/00	B21C23/00		1074
B21C23/004	8	{using vibratory energy}	B21C23/00	B21C23/00		58
B21C23/005	8	{Continuous extrusion starting from solid state material (B21C23/008 takes precedence)}	B21C23/00	B21C23/00		497
B21C23/007	8	{Hydrostatic extrusion}	B21C23/00	B21C23/00		352
B21C23/008	9	{Continuous extrusion}	B21C23/00	B21C23/00		91
B21C23/009	8	{Gas treatment of work (for heating or cooling only B21C29/003)}	B21C23/00	B21C23/00		160
B21C23/01	8	starting from material of particular form or shape, e.g. mechanically pre-treated (B21C23/22 takes precedence)	B21C23/01	B21C23/01		458
B21C23/02	8	Making uncoated products	B21C23/02	B21C23/02		406
B21C23/03	9	by both direct and backward extrusion	B21C23/03	B21C23/03		290
B21C23/035	10	{Making products of generally elongated shape}	B21C23/03	B21C23/03		40
B21C23/04	9	by direct extrusion	B21C23/04	B21C23/04		305
B21C23/06	10	Making sheets	B21C23/06	B21C23/06		282
B21C23/08	10	Making wire, rods or tubes	B21C23/08	B21C23/08		811
B21C23/085	11	{Making tubes (B21C23/10 take precedence)}	B21C23/08	B21C23/08		1062
B21C23/10	11	Making finned tubes	B21C23/10	B21C23/10		205
B21C23/12	11	Extruding bent tubes or rods	B21C23/12	B21C23/12		125
B21C23/14	10	Making other products	B21C23/14	B21C23/14		803
B21C23/142	11	{Making profiles}	B21C23/14	B21C23/14		607
B21C23/145	12	{Interlocking profiles}	B21C23/14	B21C23/14		69
B21C23/147	11	{Making drill blanks}	B21C23/14	B21C23/14		93
B21C23/16	11	Making turbo blades or propellers	B21C23/16	B21C23/16		113
B21C23/18	9	by impact extrusion	B21C23/18	B21C23/18		198
B21C23/183	10	{by forward extrusion}	B21C23/18	B21C23/18		98
B21C23/186	10	{by backward extrusion}	B21C23/18	B21C23/18		120
B21C23/20	9	by backward extrusion	B21C23/20	B21C23/20		464
B21C23/205	10	{Making products of generally elongated shape}	B21C23/20	B21C23/20		173
B21C23/21	8	Presses specially adapted for extruding metal	B21C23/21	B21C23/21		1040
B21C23/211	9	{Press driving devices}	B21C23/21	B21C23/21		441
B21C23/212	9	{Details (B21C23/217, B21C23/218 take precedence)}	B21C23/21	B21C23/21		756
B21C23/214	10	{Devices for changing die or container}	B21C23/21	B21C23/21		203
B21C23/215	10	{Devices for positioning or centering press components, e.g. die or container}	B21C23/21	B21C23/21		191
B21C23/217	9	{Tube extrusion presses (B21C23/218 takes precedence)}	B21C23/21	B21C23/21		330
B21C23/218	9	{Indirect extrusion presses}	B21C23/21	B21C23/21		190
B21C23/22	8	Making metal-coated products; Making products from two or more metals	B21C23/22	B21C23/22		610
B21C23/24	9	Covering indefinite lengths of metal or non-metal material with a metal coating	B21C23/24	B21C23/24		214
B21C23/26	10	Applying metal coats to cables, e.g. to insulated electric cables	B21C23/26	B21C23/26		84
B21C23/28	11	on intermittently-operating extrusion presses	B21C23/28	B21C23/28		64
B21C23/30	11	on continuously-operating extrusion presses	B21C23/30	B21C23/30		261
B21C23/32	8	Lubrication of metal being extruded or of dies, or the like, e.g. physical state of lubricant, location where lubricant is applied	B21C23/32	B21C23/32		790
B21C25/00	7	Profiling tools for metal extruding	B21C25/00	B21C25/00		485
B21C25/02	8	Dies	B21C25/02	B21C25/02		3034
B21C25/025	9	{Selection of materials therefor}	B21C25/02	B21C25/02		228
B21C25/04	8	Mandrels	B21C25/04	B21C25/04		311
B21C25/06	8	Press heads, dies, or mandrels for coating work	B21C25/06	B21C25/06		353
B21C25/08	8	Dies or mandrels with section variable during extruding, e.g. for making tapered work; Controlling variation	B21C25/08	B21C25/08		354
B21C25/10	8	Making tools by operations not covered by a single other subclass	B21C25/10	B21C25/10		138
B21C26/00	7	Rams or plungers for metal extruding; Discs therefor	B21C26/00	B21C26/00		395
B21C27/00	7	Containers for metal to be extruded (B21C29/02 takes precedence)	B21C27/00	B21C27/00		295
B21C27/02	8	for making coated work	B21C27/02	B21C27/02		12
B21C27/04	8	Venting metal-container chamber	B21C27/04	B21C27/04		79
B21C29/00	7	Cooling or heating extruded work or parts of the extrusion press	B21C29/00	B21C29/00		401
B21C29/003	8	{Cooling or heating of work}	B21C29/00	B21C29/00		1114
B21C29/02	8	of containers for metal to be extruded	B21C29/02	B21C29/02		193
B21C29/04	8	of press heads, dies, or mandrels	B21C29/04	B21C29/04		626
B21C31/00	7	Control devices for metal extruding, e.g. for regulating the pressing speed or temperature of metal (B21C25/08 takes precedence); Measuring devices, e.g. for temperature of metal, combined with or specially adapted for use in connection with extrusion presses	B21C31/00	B21C31/00		1093
B21C33/00	7	Feeding extrusion presses with metal to be extruded {; Loading the dummy block}	B21C33/00	B21C33/00		687
B21C33/002	8	{Encapsulated billet}	B21C33/00	B21C33/00		50
B21C33/004	8	{Composite billet}	B21C33/00	B21C33/00		170
B21C33/006	8	{Consecutive billets, e.g. billet profiles allowing air expulsion or bonding of billets}	B21C33/00	B21C33/00		82
B21C33/008	8	{Scalping billets, e.g. for removing oxide layers prior or during extrusion}	B21C33/00	B21C33/00		25
B21C33/02	8	the metal being in liquid form	B21C33/02	B21C33/02		223
B21C35/00	7	Removing work or waste from extruding presses; Drawing-off extruded work (in connection with the extruding of bent tubes or rods B21C23/12); Cleaning dies, ducts, containers, or mandrels for metal extruding	B21C35/00	B21C35/00		117
B21C35/02	8	Removing or drawing-off work	B21C35/02	B21C35/02		975
B21C35/023	9	{Work treatment directly following extrusion, e.g. further deformation or surface treatment&#160; (B21C35/03&#160;takes precedence; gas treatment&#160;B21C23/009)}	B21C35/02	B21C35/02		348
B21C35/026	10	{Removing sections from the extruded work, e.g. removing a strip to create an open profile}	B21C35/02	B21C35/02		95
B21C35/03	9	Straightening the work	B21C35/03	B21C35/03		215
B21C35/04	8	Cutting-off or removing waste	B21C35/04	B21C35/04		605
B21C35/06	8	Cleaning dies, ducts, containers or mandrels	B21C35/06	B21C35/06		180
B21C37/00	7	Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape	B21C37/00	B21C37/00		604
B21C37/02	8	of sheets	B21C37/02	B21C37/02		1896
B21C37/04	8	of rods or wire	B21C37/04	B21C37/04		1447
B21C37/042	9	{Manufacture of coated wire or rods}	B21C37/04	B21C37/04		551
B21C37/045	9	{Manufacture of wire or rods with particular section or properties}	B21C37/04	B21C37/04		632
B21C37/047	9	{of fine wires}	B21C37/04	B21C37/04		979
B21C37/06	8	of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes	B21C37/06	B21C37/06		1885
B21C37/065	9	{starting from a specific blank, e.g. tailored blank}	B21C37/06	B21C37/06		194
B21C37/08	9	Making tubes with welded or soldered seams {(with helically arranged seams B21C37/122)}	B21C37/08	B21C37/08		1926
B21C37/0803	10	{the tubes having a special shape, e.g. polygonal tubes}	B21C37/08	B21C37/08		538
B21C37/0807	10	{Tube treating or manipulating combined with, or specially adapted for use in connection with tube making machines, e.g. drawing-off devices, cutting-off}	B21C37/08	B21C37/08		323
B21C37/0811	11	{removing or treating the weld bead}	B21C37/08	B21C37/08		311
B21C37/0815	10	{without continuous longitudinal movement of the sheet during the bending operation}	B21C37/08	B21C37/08		371
B21C37/0818	10	{Manufacture of tubes by drawing of strip material through dies}	B21C37/08	B21C37/08		121
B21C37/0822	10	{Guiding or aligning the edges of the bent sheet}	B21C37/08	B21C37/08		218
B21C37/0826	10	{Preparing the edges of the metal sheet with the aim of having some effect on the weld}	B21C37/08	B21C37/08		75
B21C37/083	10	Supply, or operations combined with supply, of strip material	B21C37/083	B21C37/083		393
B21C37/087	10	using rods or strips of soldering material	B21C37/087	B21C37/087		44
B21C37/09	10	of coated strip material {; Making multi-wall tubes}	B21C37/09	B21C37/09		433
B21C37/10	9	Making tubes with {seams being neither welded nor soldered, e.g.} riveted seams {(with helically arranged seams B21C37/121)}	B21C37/10	B21C37/10		139
B21C37/101	10	{Making of the seams}	B21C37/10	B21C37/10		180
B21C37/102	10	{of coated strip material; Making multi-wall tubes}	B21C37/10	B21C37/10		23
B21C37/104	10	{the tubes having a special shape, e.g. polygonal tubes}	B21C37/10	B21C37/10		171
B21C37/105	10	{Supply, or operations combined with supply, of strip material}	B21C37/10	B21C37/10		24
B21C37/107	10	{Tube treating or manipulating combined with or specially adapted for use in connection with tube-making machines, e.g. drawing-off devices, cutting-off}	B21C37/10	B21C37/10		21
B21C37/108	10	{without continuous longitudinal movement of the sheet during the bending operation}	B21C37/10	B21C37/10		55
B21C37/12	9	Making tubes or metal hoses with helically arranged seams	B21C37/12	B21C37/12		637
B21C37/121	10	{with seams being neither welded nor soldered}	B21C37/12	B21C37/12		347
B21C37/122	10	{with welded or soldered seams}	B21C37/12	B21C37/12		300
B21C37/123	10	{of coated strip material; Making multi-wall tubes}	B21C37/12	B21C37/12		155
B21C37/124	10	{the tubes having a special shape, e.g. with corrugated wall, flexible tubes}	B21C37/12	B21C37/12		676
B21C37/125	11	{curved section, e.g. elbow}	B21C37/12	B21C37/12		38
B21C37/126	10	{Supply, or operations combined with supply, of strip material}	B21C37/12	B21C37/12		249
B21C37/127	10	{Tube treating or manipulating combined with or specially adapted for use in connection with tube making machines, e.g. drawing-off devices, cutting-off}	B21C37/12	B21C37/12		181
B21C37/128	10	{Control or regulating devices}	B21C37/12	B21C37/12		105
B21C37/14	9	Making tubes from doubled flat material	B21C37/14	B21C37/14		222
B21C37/15	9	Making tubes of special shape; Making {tube} fittings {(B21C37/0803, B21C37/104, B21C37/124 take precedence)}	B21C37/15	B21C37/15		679
B21C37/151	10	{Making tubes with multiple passages}	B21C37/15	B21C37/15		468
B21C37/152	10	{Making rifle or gun barrels}	B21C37/15	B21C37/15		76
B21C37/153	11	{Making tubes with inner or outer guides}	B21C37/15	B21C37/15		101
B21C37/154	10	{Making multi-wall tubes}	B21C37/15	B21C37/15		607
B21C37/155	10	{Making tubes with non-circular section (B21C37/151, B21C37/154 take precedence)}	B21C37/15	B21C37/15		345
B21C37/156	10	{Making tubes with wall irregularities (B21C37/20, B21C37/22 take precedence)}	B21C37/15	B21C37/15		38
B21C37/157	11	{Perforations}	B21C37/15	B21C37/15		174
B21C37/158	11	{Protrusions, e.g. dimples}	B21C37/15	B21C37/15		136
B21C37/16	10	Making tubes with varying diameter in longitudinal direction	B21C37/16	B21C37/16		412
B21C37/18	11	conical tubes	B21C37/18	B21C37/18		243
B21C37/185	12	{starting from sheet material}	B21C37/18	B21C37/18		173
B21C37/20	10	Making helical or similar guides in or on tubes without removing material, e.g. by drawing same over mandrels, by pushing same through dies {; Making tubes with angled walls, ribbed tubes or tubes with decorated walls}	B21C37/20	B21C37/20		264
B21C37/202	11	{with guides parallel to the tube axis}	B21C37/20	B21C37/20		213
B21C37/205	11	{with annular guides}	B21C37/20	B21C37/20		201
B21C37/207	11	{with helical guides}	B21C37/20	B21C37/20		537
B21C37/22	10	Making finned or ribbed tubes by fixing strip or like material to tubes	B21C37/22	B21C37/22		249
B21C37/225	11	{longitudinally-ribbed tubes}	B21C37/22	B21C37/22		160
B21C37/24	11	annularly-ribbed tubes	B21C37/24	B21C37/24		282
B21C37/26	11	helically-ribbed tubes	B21C37/26	B21C37/26		757
B21C37/28	10	Making tube fittings for connecting pipes, e.g. U-pieces	B21C37/28	B21C37/28		331
B21C37/283	11	{Making U-pieces (B21C37/286 takes precedence)}	B21C37/28	B21C37/28		351
B21C37/286	11	{starting from sheet material}	B21C37/28	B21C37/28		151
B21C37/29	11	Making branched pieces, e.g. T-pieces	B21C37/29	B21C37/29		413
B21C37/292	12	{Forming collars by drawing or pushing a rigid forming tool through an opening in the tube wall}	B21C37/29	B21C37/29		320
B21C37/294	12	{Forming collars by compressing a fluid or a yieldable or resilient mass in the tube}	B21C37/29	B21C37/29		156
B21C37/296	12	{Making branched pieces starting from strip material; Making branched tubes by securing a secondary tube in an opening in the undeformed wall of a principal tube}	B21C37/29	B21C37/29		121
B21C37/298	12	{Forming collars by flow-drilling}	B21C37/29	B21C37/29		166
B21C37/30	9	Finishing tubes, e.g. sizing, burnishing	B21C37/30	B21C37/30		780
B21C43/00	7	Devices for cleaning metal products combined with or specially adapted for use with machines or apparatus provided for in this subclass	B21C43/00	B21C43/00		293
B21C43/02	8	combined with or specially adapted for use in connection with drawing or winding machines or apparatus	B21C43/02	B21C43/02		657
B21C43/04	9	Devices for de-scaling wire or like flexible work	B21C43/04	B21C43/04		508
B21C45/00	7	Separating mandrels from work or vice versa	B21C45/00	B21C45/00		150
B21C47/00	7	Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only (coiling wire into particular forms B21F3/00)	B21C47/00	B21C47/00		251
B21C47/003	8	{Regulation of tension or speed; Braking}	B21C47/00	B21C47/00		773
B21C47/006	8	{winding-up or winding-off several parallel metal bands}	B21C47/00	B21C47/00		302
B21C47/02	8	Winding-up or coiling	B21C47/02	B21C47/02		1352
B21C47/04	9	on or in reels or drums, without using a moving guide	B21C47/04	B21C47/04		1041
B21C47/045	10	{in rotating drums}	B21C47/04	B21C47/04		301
B21C47/06	10	with loaded rollers, bolts, or equivalent means holding the material on the reel or drum	B21C47/06	B21C47/06		164
B21C47/063	11	{with pressure rollers only}	B21C47/06	B21C47/06		243
B21C47/066	11	{with belt wrappers only}	B21C47/06	B21C47/06		80
B21C47/08	9	without making use of a reel or drum, the first turn being formed by a stationary guide	B21C47/08	B21C47/08		132
B21C47/10	9	by means of a moving guide	B21C47/10	B21C47/10		131
B21C47/12	10	the guide moving parallel to the axis of the coil (B21C47/14 takes precedence)	B21C47/12	B21C47/12		235
B21C47/14	10	by means of a rotating guide, e.g. laying the material around a stationary reel or drum	B21C47/14	B21C47/14		481
B21C47/143	11	{the guide being a tube}	B21C47/14	B21C47/14		291
B21C47/146	11	{Controlling or influencing the laying pattern of the coils}	B21C47/14	B21C47/14		114
B21C47/16	8	Unwinding or uncoiling	B21C47/16	B21C47/16		320
B21C47/18	9	from reels or drums	B21C47/18	B21C47/18		1240
B21C47/20	10	the unreeled material moving transversely to the tangent line of the drum, e.g. axially, radially	B21C47/20	B21C47/20		248
B21C47/22	9	Unwinding coils without reels or drums	B21C47/22	B21C47/22		116
B21C47/24	8	Transferring coils to or from winding apparatus or to or from operative position therein; Preventing uncoiling during transfer	B21C47/24	B21C47/24		1792
B21C47/242	9	{Devices for swinging the coil from horizontal to vertical, or vice versa}	B21C47/24	B21C47/24		120
B21C47/245	9	{Devices for the replacement of full reels by empty reels or vice versa, without considerable loss of time}	B21C47/24	B21C47/24		373
B21C47/247	9	{Joining wire or band ends}	B21C47/24	B21C47/24		199
B21C47/26	8	Special arrangements with regard to simultaneous or subsequent treatment of the material	B21C47/26	B21C47/26		1128
B21C47/262	9	{Treatment of a wire, while in the form of overlapping non-concentric rings}	B21C47/26	B21C47/26		289
B21C47/265	9	{"helicofil" systems}	B21C47/26	B21C47/26		164
B21C47/267	9	{Scrap treatment}	B21C47/26	B21C47/26		117
B21C47/28	8	Drums or other coil-holders	B21C47/28	B21C47/28		1272
B21C47/30	9	expansible or contractible	B21C47/30	B21C47/30		944
B21C47/32	8	Tongs or gripping means specially adapted for reeling operations	B21C47/32	B21C47/32		255
B21C47/323	9	{Slits or pinces on the cylindrical wall of a reel or bobbin, adapted to grip the end of the material being wound}	B21C47/32	B21C47/32		209
B21C47/326	9	{Devices for pressing the end of the material being wound against the cylindrical wall of the reel or bobbin}	B21C47/32	B21C47/32		95
B21C47/34	8	Feeding or guiding devices not specially adapted to a particular type of apparatus	B21C47/34	B21C47/34		1634
B21C47/3408	9	{for monitoring the lateral position of the material}	B21C47/34	B21C47/34		53
B21C47/3416	10	{with lateral edge contact}	B21C47/34	B21C47/34		124
B21C47/3425	10	{without lateral edge contact}	B21C47/34	B21C47/34		104
B21C47/3433	9	{for guiding the leading end of the material, e.g. from or to a coiler}	B21C47/34	B21C47/34		496
B21C47/3441	10	{Diverting the leading end, e.g. from main flow to a coiling device}	B21C47/34	B21C47/34		146
B21C47/345	9	{for monitoring the tension or advance of the material}	B21C47/34	B21C47/34		178
B21C47/3458	10	{Endlessly revolving chain systems}	B21C47/34	B21C47/34		44
B21C47/3466	9	{by using specific means}	B21C47/34	B21C47/34		27
B21C47/3475	10	{Fluid pressure or vacuum}	B21C47/34	B21C47/34		109
B21C47/3483	10	{Magnetic field}	B21C47/34	B21C47/34		73
B21C47/3491	10	{Brushes}	B21C47/34	B21C47/34		11
B21C49/00	7	Devices for temporarily accumulating material	B21C49/00	B21C49/00		439
B21C51/00	7	Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B&#160;-&#160;B21F	B21C51/00	B21C51/00		9713
B21C51/005	8	{Marking devices}	B21C51/00	B21C51/00		754
B21C99/00	7	Subject matter not provided for in other groups of this subclass	B21C99/00	B21C99/00		12
