Evgeny I. Shemyakin

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Novosibirsk, SU

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Patents Grantslast 30 patents

Information Patent Grant
Reversible air-operated percussive action machine for driving holes...
- Patent number 4,708,211
- Issue date Nov 24, 1987
- Institut Gornogo Dela So An SSSR
- Evgeny I. Shemyakin
- E21 - EARTH DRILLING MINING