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1. Earth Drilling  (2)
2. Obtaining Oil, Gas, Water, Soluble Or Meltable Materials Or Aslurry Of Minerals From Wells  (2)
3. Earth Drilling, E.G. Deep Drilling  (2)
4. Mining  (2)
5. Fixed Constructions  (2)
6. Pipe-Lines  (1)
7. Lighting  (1)
8. Controlling  (1)
9. Computer Systems Based On Specific Computational Models  (1)
10. Calculating  (1)
11. Control Or Regulating Systems In General  (1)
12. Blasting  (1)
13. Computing  (1)
14. Functional Elements Of Such Systems  (1)
15. Heating  (1)
16. Physics  (1)
17. Counting  (1)
18. Monitoring Or Testing Arrangements For Such Systems Orelements  (1)
19. Mechanical Engineering  (1)
20. Pipe-Line Systems  (1)
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