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1. Lighting  (3)
2. Pipe-Lines  (3)
3. Earth Drilling  (3)
4. Weapons  (3)
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6. Heating  (3)
7. Obtaining Oil, Gas, Water, Soluble Or Meltable Materials Or Aslurry Of Minerals From Wells  (3)
8. Earth Drilling, E.G. Deep Drilling  (3)
9. Mining  (3)
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12. Storing Of Distributing Gases Or Liquids  (3)
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19. Control Or Regulating Systems In General  (1)
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