Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
Inventor
active
Polyester fiber dyeable under normal pressure and process for th
Porous regenerated cellulose hollow fiber and process for prepar
Porous regenerated cellulose membrane and process for the prepar
Process for the preparation of a porous regenerated cellulose ho
Process for the production of a polyester fiber dyeable under no
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