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Creation Date 

1. Before 1952  (17)
2. 1952 To 1954  (9)
3. 1955 To 1957  (8)
4. 1958 To 1961  (20)
5. After 1961  (7)
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Subject 

1. Chemistry  (13)
2. Metallurgy  (13)
3. Textiles  (10)
4. Production Of Cellulose  (10)
5. Paper-Making  (10)
6. Transporting  (8)
7. Performing Operations  (8)
8. Paper Not Otherwise Provided For  (7)
9. Preparation Thereof Not Covered By Subclasses D21c Or D21d  (7)
10. Impregnating Or Coating Of Paper  (7)
11. Compositions Based Thereon  (7)
12. Pulp Compositions  (7)
13. Their Preparation Or Chemical Working-Up  (7)
14. Treatment Of Finished Paper Not Covered By Class B31 Or Subclass D21g  (7)
15. Organic Macromolecular Compounds  (7)
16. Organic Chemistry  (6)
17. Polysaccharides  (5)
18. Derivatives Thereof  (5)
19. Acyclic Or Carbocyclic Compounds  (4)
20. Flexible Materials Not Otherwise Provided For  (3)
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