(under subclass 91) Processes directed to the digestion or chemical in which the material treatment of fibrous material, other than a wood, not provided for in any of the preceding subclasses (92-98).
(1) Note. Types of material, the treatment of which is classifiable in this subclass, are noncereal grasses such as esparto, as well as leaves, roots, reeds, stems, seaweed and other forms of aquatic plant life.
