David I. Kogan

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Moscow, SU

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Patents Grantslast 30 patents

Information Patent Grant
Annular air-hammer apparatus for drilling holes
- Patent number 4,722,403
- Issue date Feb 2, 1988
- Institut Gornogo Dela Sibirskogo Otdelenia Akademii Nauk SSSR
- Alexandr D. Kostylev
- E21 - EARTH DRILLING MINING
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
Information Patent Grant
Annular air-hammer apparatus for drilling holes
- Patent number 4,705,119
- Issue date Nov 10, 1987
- Institut Gornogo Dela So An SSSR
- Alexandr D. Kostylev
- E21 - EARTH DRILLING MINING