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1. Before 1980  (8)
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Subject 

1. Paper Not Otherwise Provided For  (53)
2. Preparation Thereof Not Covered By Subclasses D21c Or D21d  (53)
3. Impregnating Or Coating Of Paper  (53)
4. Pulp Compositions  (53)
5. Treatment Of Finished Paper Not Covered By Class B31 Or Subclass D21g  (53)
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8. Fibrous Raw Materials Or Their Mechanical Treatment  (19)
9. Treatment Of The Materials Before Passing To The Paper-Makingmachine  (17)
10. Compositions Based Thereon  (16)
11. Their Preparation Or Chemical Working-Up  (16)
12. Organic Macromolecular Compounds  (16)
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Language 

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