D01C1/00	7	Treatment of vegetable material	D01C1/00	D01C1/00		483
D01C1/02	8	by chemical methods to obtain bast fibres	D01C1/02	D01C1/02		1301
D01C1/04	8	Bacteriological retting	D01C1/04	D01C1/04		354
D01C3/00	7	Treatment of animal material, e.g. chemical scouring of wool	D01C3/00	D01C3/00		1073
D01C3/02	8	De-gumming silk	D01C3/02	D01C3/02		351
D01C5/00	7	Carbonising rags to recover animal fibres	D01C5/00	D01C5/00		198
