E21F1/00	7	Ventilation of mines or tunnels; Distribution of ventilating currents (ventilating rooms or spaces in general F24F)	E21F1/00	E21F1/00		1340
E21F1/003	8	{Ventilation of traffic tunnels (during construction E21F1/04&#160;-&#160;E21F3/00)}	E21F1/00	E21F1/00		1243
E21F1/006	8	{Ventilation at the working face of galleries or tunnels}	E21F1/00	E21F1/00		998
E21F1/02	8	Test models (analogue computers therefor G06G7/50)	E21F1/02	E21F1/02		137
E21F1/04	8	Air ducts (suspension devices E21F17/02)	E21F1/04	E21F1/04		1110
E21F1/06	9	Duct connections (tube connections in general F16L)	E21F1/06	E21F1/06		336
E21F1/08	8	Ventilation arrangements in connection with air ducts, e.g. arrangements for mounting ventilators ({E21F1/003 takes precedence}; ventilators in general F04D)	E21F1/08	E21F1/08		1333
E21F1/085	9	{using compressed gas injectors}	E21F1/08	E21F1/08		53
E21F1/10	8	Air doors ({E21F1/003 takes precedence; air locks E21F1/145; dam doors E21F17/12}; doors in general E06B)	E21F1/10	E21F1/10		739
E21F1/12	9	Devices for automatically opening air doors	E21F1/12	E21F1/12		236
E21F1/14	8	Air partitions; Air locks ({E21F1/003 takes precedence}; dams E21F17/103; air locks for foundations E02D)	E21F1/14	E21F1/14		197
E21F1/145	9	{Air locks (air doors E21F1/10; dam doors E21F17/12)}	E21F1/14	E21F1/14		135
E21F1/16	8	Shaft covers	E21F1/16	E21F1/16		96
E21F1/18	8	Gravity flow ventilation (E21F1/02&#160;-&#160;E21F1/16 take precedence)	E21F1/18	E21F1/18		87
E21F3/00	7	Cooling or drying of air (air-conditioning rooms or spaces in general F24F)	E21F3/00	E21F3/00		1069
E21F5/00	7	Means or methods for preventing, binding, depositing, or removing dust {(in combination with mining machines E21C35/22)}; Preventing explosions or fires (dams E21F17/103; applying liquids or other fluent materials to surfaces in general B05)	E21F5/00	E21F5/00		2019
E21F5/02	8	by wetting or spraying	E21F5/02	E21F5/02		785
E21F5/04	9	Spraying barriers (spray nipples, spraying in general B05B, B05D; picks with arrangements of fluid-spraying nozzles E21C35/187)	E21F5/04	E21F5/04		2066
E21F5/06	9	Fluids used for spraying	E21F5/06	E21F5/06		344
E21F5/08	8	Rock dusting of mines; Depositing other protective substances	E21F5/08	E21F5/08		220
E21F5/10	9	Devices for rock dusting	E21F5/10	E21F5/10		108
E21F5/12	9	Composition of rock dust	E21F5/12	E21F5/12		41
E21F5/14	8	Fluid barriers or rock dusters made to work by, or at the same time as, shots or explosions	E21F5/14	E21F5/14		67
E21F5/143	9	{Fluid barriers}	E21F5/14	E21F5/14		198
E21F5/146	9	{Rock dusters}	E21F5/14	E21F5/14		88
E21F5/16	8	Layers of hygroscopic or other salts deposited on floors, walls, or the like, for binding dust; Deposition of such layers (dust-absorbing materials in general C09K3/22)	E21F5/16	E21F5/16		84
E21F5/18	8	Impregnating walls, or the like, with liquids for binding dust {(injections for improving soil or rock E21D9/001; borehole closures, i.e. packers, for use during the injection process E21B33/12)}	E21F5/18	E21F5/18		138
E21F5/20	8	Drawing-off or depositing dust ({dust-removing while drilling E21B21/011}; while slitting E21C35/22)	E21F5/20	E21F5/20		1449
E21F7/00	7	Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose	E21F7/00	E21F7/00		3776
E21F9/00	7	Devices preventing sparking of machines or apparatus (preventing sparking of electric machines or apparatus H01K, H02K)	E21F9/00	E21F9/00		111
E21F11/00	7	Rescue devices or other safety devices, e.g. safety chambers or escape ways (breathing aids for curative purposes A61H31/00; respiratory apparatus A62B7/00; breathing apparatus for accidentally buried persons A62B33/00)	E21F11/00	E21F11/00		1994
E21F13/00	7	Transport specially adapted to underground conditions (mine cars B61D; transport in general, loading {unless specially adapted to underground conditions}B65G)	E21F13/00	E21F13/00		1134
E21F13/002	8	{Crushing devices specifically for conveying in mines}	E21F13/00	E21F13/00		227
E21F13/004	8	{Staff transport system}	E21F13/00	E21F13/00		183
E21F13/006	8	{Equipment transport systems}	E21F13/00	E21F13/00		633
E21F13/008	9	{for mine roof support units for step-by-step movement}	E21F13/00	E21F13/00		106
E21F13/02	8	{Transport of mined mineral} in galleries	E21F13/02	E21F13/02		636
E21F13/025	9	{Shuttle cars}	E21F13/02	E21F13/02		291
E21F13/04	8	{Transport of mined material} in gravity inclines; in staple or inclined shafts	E21F13/04	E21F13/04		451
E21F13/042	9	{Vertical hydraulic conveying of coal (conveying by water flow in general B65G53/00)}	E21F13/04	E21F13/04		96
E21F13/045	9	{Bunkers specially adapted for mining purposes (chutes in general B65G11/00)}	E21F13/04	E21F13/04		41
E21F13/047	9	{comprising helically running channels (chutes of helical form in general B65G11/06)}	E21F13/04	E21F13/04		45
E21F13/06	8	{Transport of mined material} at or adjacent to the working face	E21F13/06	E21F13/06		839
E21F13/061	9	{Chutes and braking conveyors for average and steep slopes, adapted for mining purposes (chutes in general B65G11/00)}	E21F13/06	E21F13/06		105
E21F13/063	9	{Loading devices for use in mining}	E21F13/06	E21F13/06		285
E21F13/065	10	{Scrapers (digging devices guided by cables E02F3/54; combined with planing means E21C27/42)}	E21F13/06	E21F13/06		205
E21F13/066	9	{Scraper chain conveyors (in general B65G19/00)}	E21F13/06	E21F13/06		342
E21F13/068	10	{Special adaptations for use at the junction of the working face with the gallery, e.g. driving stations coupled to the driving station of the winning machine}	E21F13/06	E21F13/06		120
E21F13/08	8	Shifting conveyors or other transport devices from one location at the working face to another (guiding mining machines along conveyors for the cut mineral E21C35/12; in combination with mine roof supports for step-by-step movement E21D23/00)	E21F13/08	E21F13/08		205
E21F13/083	9	{Conveyor belts removing methods or devices}	E21F13/08	E21F13/08		61
E21F13/086	9	{Armoured conveyors shifting devices}	E21F13/08	E21F13/08		382
E21F13/10	8	Anchorings for conveyors	E21F13/10	E21F13/10		263
E21F15/00	7	Methods or devices for placing filling-up materials in underground workings (dams E21F17/103{; chocks made of flexible containers filled with backfilling material E21D15/483})	E21F15/00	E21F15/00		2408
E21F15/005	8	{characterised by the kind or composition of the backfilling material}	E21F15/00	E21F15/00		1619
E21F15/02	8	Supporting means, e.g. shuttering, for filling-up materials	E21F15/02	E21F15/02		420
E21F15/04	9	Stowing mats; Goaf wire netting; Partition walls	E21F15/04	E21F15/04		520
E21F15/06	8	Filling-up mechanically	E21F15/06	E21F15/06		816
E21F15/08	8	Filling-up hydraulically or pneumatically (hydraulic or pneumatic transport devices B65G; pipes, pipe couplings F16L)	E21F15/08	E21F15/08		841
E21F15/10	9	Hydraulic or pneumatic filling-up machines	E21F15/10	E21F15/10		427
E21F16/00	7	Drainage (keeping dry foundation sites or other areas in the ground E02D19/00)	E21F16/00	E21F16/00		1528
E21F16/02	8	of tunnels	E21F16/02	E21F16/02		2487
E21F17/00	7	Methods or devices for use in mines or tunnels, not covered elsewhere (mine lighting F21, H05B)	E21F17/00	E21F17/00		6170
E21F17/02	8	Suspension devices for tubes or the like, e.g. for ventilating ducts (supporting pipes, cables or protective tubing in general F16L3/00&#160;-&#160;F16L7/00)	E21F17/02	E21F17/02		810
E21F17/04	8	Distributing means for power supply in mines	E21F17/04	E21F17/04		59
E21F17/06	9	Distributing electric power; Cable networks; Conduits for cables (circuit arrangements for supplying or distributing electric power in general H02J)	E21F17/06	E21F17/06		438
E21F17/08	9	Distributing hydraulic power; Pipe networks for hydraulic liquid (pipe-line systems in general F17D)	E21F17/08	E21F17/08		107
E21F17/10	9	Distributing pneumatic power; Pipe networks for compressed air (pipe-line systems in general F17D)	E21F17/10	E21F17/10		114
E21F17/103	8	Dams, e.g. for ventilation	E21F17/103	E21F17/103		791
E21F17/107	9	inflatable	E21F17/107	E21F17/107		205
E21F17/12	9	Dam doors {(air doors E21F1/10; air locks E21F1/145)}	E21F17/12	E21F17/12		437
E21F17/16	8	Modification of mine passages or chambers for storage purposes, especially for liquids or gases (storing fluids in natural or artificial cavities or chambers in the earth B65G5/00)	E21F17/16	E21F17/16		917
E21F17/18	8	Special adaptations of signalling or alarm devices (for mine lifts B66B; gas-sensitive devices per seG01N)	E21F17/18	E21F17/18		9972
E21F17/185	9	{Rock-pressure control devices with or without alarm devices; Alarm devices in case of roof subsidence (props with load-measuring devices E21D15/46)}	E21F17/18	E21F17/18		564
