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Creation Date 

1. Before 1981  (74)
2. 1981 To 1986  (129)
3. 1987 To 1992  (83)
4. 1993 To 1999  (90)
5. After 1999  (34)
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Subject 

1. Apparatus Therefor  (222)
2. Regeneration Of Pulping Liquors  (218)
3. Production Of Cellulose By Removing Non-Cellulose Substancesfrom Cellulose-Containing Materials  (218)
4. Paper Not Otherwise Provided For  (124)
5. Preparation Thereof Not Covered By Subclasses D21c Or D21d  (124)
6. Impregnating Or Coating Of Paper  (124)
7. Pulp Compositions  (124)
8. Treatment Of Finished Paper Not Covered By Class B31 Or Subclass D21g  (124)
9. Transporting  (122)
10. Performing Operations  (122)
11. Fibrous Raw Materials Or Their Mechanical Treatment  (111)
12. Chemistry  (81)
13. Metallurgy  (81)
14. Nailing Or Stapling Machines In General  (74)
15. Working Or Preserving Wood Or Similar Material  (74)
16. Treatment Of The Materials Before Passing To The Paper-Makingmachine  (35)
17. Adhesives  (34)
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Language 

1. French  (1)
2. English  (1)
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