D21B1/00	7	Fibrous raw materials or their mechanical treatment (pretreatment of the finely-divided materials before digesting D21C1/00; methods of beating or refining pulp D21D1/00; purification of the pulp suspension by mechanical means D21D5/00)	D21B1/00	D21B1/00		296
D21B1/02	8	Pretreatment of the raw materials by chemical or physical means (removal of bark B27L)	D21B1/02	D21B1/02		627
D21B1/021	9	{by chemical means}	D21B1/02	D21B1/02		463
D21B1/023	9	{Cleaning wood chips or other raw materials}	D21B1/02	D21B1/02		333
D21B1/025	9	{Separating pith from fibrous vegetable materials}	D21B1/02	D21B1/02		62
D21B1/026	9	{Separating fibrous materials from waste}	D21B1/02	D21B1/02		214
D21B1/028	10	{by dry methods}	D21B1/02	D21B1/02		161
D21B1/04	8	by dividing raw materials into small particles, e.g. fibres (breaking-up or cutting wood or the like by dry methods B27L; mechanical separation of fibres from plant material D01B1/00; hackling or heckling machines D01B5/00)	D21B1/04	D21B1/04		152
D21B1/06	9	by dry methods	D21B1/06	D21B1/06		494
D21B1/061	10	{using cutting devices}	D21B1/06	D21B1/06		377
D21B1/063	10	{using grinding devices}	D21B1/06	D21B1/06		538
D21B1/065	11	{of the magazine type}	D21B1/06	D21B1/06		7
D21B1/066	10	{the raw material being pulp sheets}	D21B1/06	D21B1/06		130
D21B1/068	11	{by cutting actions}	D21B1/06	D21B1/06		42
D21B1/08	10	the raw material being waste paper (chemical part D21C5/02); the raw material being rags	D21B1/08	D21B1/08		343
D21B1/10	11	by cutting actions	D21B1/10	D21B1/10		284
D21B1/12	9	by wet methods, by the use of steam (beaters D21D1/00)	D21B1/12	D21B1/12		736
D21B1/14	10	Disintegrating in mills	D21B1/14	D21B1/14		320
D21B1/16	11	in the presence of chemical agents	D21B1/16	D21B1/16		415
D21B1/18	11	in magazine-type machines	D21B1/18	D21B1/18		22
D21B1/20	12	with chain feed	D21B1/20	D21B1/20		18
D21B1/22	12	with screw feed	D21B1/22	D21B1/22		44
D21B1/24	12	of the pocket type	D21B1/24	D21B1/24		54
D21B1/26	11	Driving or feeding arrangements	D21B1/26	D21B1/26		67
D21B1/28	11	Dressers for mill stones, combined with the mill	D21B1/28	D21B1/28		17
D21B1/30	10	Defibrating by other means	D21B1/30	D21B1/30		336
D21B1/303	11	{using vibrating devices}	D21B1/30	D21B1/30		78
D21B1/306	11	{using microwaves}	D21B1/30	D21B1/30		39
D21B1/32	11	of waste paper	D21B1/32	D21B1/32		1508
D21B1/322	12	{coated with synthetic materials}	D21B1/32	D21B1/32		102
D21B1/325	12	{de-inking devices}	D21B1/32	D21B1/32		268
D21B1/327	13	{using flotation devices}	D21B1/32	D21B1/32		223
D21B1/34	11	Kneading or mixing; Pulpers	D21B1/34	D21B1/34		234
D21B1/342	12	{Mixing apparatus}	D21B1/34	D21B1/34		371
D21B1/345	12	{Pulpers}	D21B1/34	D21B1/34		1822
D21B1/347	13	{Rotor assemblies}	D21B1/34	D21B1/34		185
D21B1/36	11	Explosive disintegration by sudden pressure reduction	D21B1/36	D21B1/36		446
D21B1/38	8	Conserving the finely-divided cellulosic material	D21B1/38	D21B1/38		59
