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1. Manufacture, Shaping, Or Supplementary Processes  (62)
2. Mineral Or Slag Wool  (62)
3. Chemistry  (62)
4. Metallurgy  (62)
5. Glass  (62)
6. Physics  (25)
7. Optics  (20)
8. Optical Elements, Systems, Or Apparatus  (20)
9. Technical Subjects Covered By Former Uspc Cross-Reference Art Collections [xracs] And Digests  (16)
10. Technologies Or Applications For Mitigation Or Adaptation Againstclimate Change  (16)
11. Climate Change Mitigation Technologies In The Production Orprocessing Of Goods  (16)
12. General Tagging Of Cross-Sectional Technologies Spanning Over Several Sections Of The Ipc  (16)
13. General Tagging Of New Technological Developments  (16)
14. Chemical Composition Of Glasses, Glazes, Or Vitreousenamels  (15)
15. Surface Treatment Of Glass  (15)
16. Joining Glass To Glass Or Other Materials  (15)
17. Surface Treatment Of Fibres Or Filaments Made From Glass,minerals Or Slags  (15)
18. Measuring  (9)
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20. Investigating Or Analysing Materials By Determining Theirchemical Or Physical Properties  (7)
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