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1. Chemistry  (3)
2. Metallurgy  (3)
3. Textiles  (2)
4. Production Of Cellulose  (2)
5. Organic Chemistry  (2)
6. Paper-Making  (2)
7. Transporting  (1)
8. Performing Operations  (1)
9. Paper Not Otherwise Provided For  (1)
10. Preparation Thereof Not Covered By Subclasses D21c Or D21d  (1)
11. Impregnating Or Coating Of Paper  (1)
12. Powder Metallurgy  (1)
13. Ferrous Or Non-Ferrous Alloys  (1)
14. Pulp Compositions  (1)
15. Pretreatment Of Raw Materials  (1)
16. Acyclic Or Carbocyclic Compounds  (1)
17. Casting Of Other Substances By The Same Processes Or Devices  (1)
18. Casting  (1)
19. Production And Refining Of Metals  (1)
20. Casting Of Metals  (1)
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