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1. Patents  (13)
2. Articles  (1)
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1. Textiles  (9)
2. Production Of Cellulose  (8)
3. Paper-Making  (8)
4. Paper Not Otherwise Provided For  (6)
5. Preparation Thereof Not Covered By Subclasses D21c Or D21d  (6)
6. Impregnating Or Coating Of Paper  (6)
7. Regeneration Of Pulping Liquors  (6)
8. Pulp Compositions  (6)
9. Apparatus Therefor  (6)
10. Treatment Of Finished Paper Not Covered By Class B31 Or Subclass D21g  (6)
11. Production Of Cellulose By Removing Non-Cellulose Substancesfrom Cellulose-Containing Materials  (6)
12. Methods Of Producing Paper Thereon  (3)
13. Paper-Making Machines  (3)
14. Transporting  (2)
15. Performing Operations  (2)
16. Fibrous Raw Materials Or Their Mechanical Treatment  (2)
17. Ammunition  (1)
18. Blasting  (1)
19. Chemistry  (1)
20. Bookbinding  (1)
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