Institut Gornogo Dela So An USSR

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Novosibirsk, SU

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Patents Grantslast 30 patents

Information Patent Grant
Annular air hammer apparatus for drilling wells
- Patent number 4,709,768
- Issue date Dec 1, 1987
- Institut Gornogo Dela So An USSR
- Alexandr D. Kostylev
- E21 - EARTH DRILLING MINING