4. E - Fixed Constructions
  5. 21
  6. B

David I. Kogan

E - Fixed Constructions – 21 – B

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Country: Ussr

Annular air hammer apparatus for drilling wells

B - Operations – Transporting – 25 – D
Patent

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Annular air-hammer apparatus for drilling holes

E - Fixed Constructions – 21 – B
Patent

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Annular air-hammer apparatus for drilling holes

E - Fixed Constructions – 21 – B
Patent

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Profile ID: LFCA-PAI-P-1201704

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