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Creation Date 

1. Before 1967  (12)
2. 1967 To 1969  (30)
3. 1970 To 1972  (49)
4. 1973 To 1976  (86)
5. After 1976  (57)
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Subject 

1. Textiles  (140)
2. Production Of Cellulose  (110)
3. Paper-Making  (110)
4. Chemistry  (77)
5. Metallurgy  (77)
6. Human Necessities  (53)
7. Transporting  (46)
8. Performing Operations  (46)
9. Hygiene  (45)
10. Medical Or Veterinary Science  (45)
11. Apparatus Therefor  (42)
12. Paper Not Otherwise Provided For  (41)
13. Preparation Thereof Not Covered By Subclasses D21c Or D21d  (41)
14. Impregnating Or Coating Of Paper  (41)
15. Regeneration Of Pulping Liquors  (41)
16. Pulp Compositions  (41)
17. Treatment Of Finished Paper Not Covered By Class B31 Or Subclass D21g  (41)
18. Production Of Cellulose By Removing Non-Cellulose Substancesfrom Cellulose-Containing Materials  (41)
19. Compositions Based Thereon  (39)
20. Organic Macromolecular Compounds  (39)
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Language 

1. English  (49)
2. French  (5)
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