Valery Y. Frenkel

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Moscow, SU

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Patents Grantslast 30 patents

Information Patent Grant
Method of making holes in the soil and apparatus for performing thi...
- Patent number 4,440,240
- Issue date Apr 3, 1984
- Institut Gornogo Dela Sibirskogo Otdelenia Akademii Nauk SSSR
- Alexandr D. Kostylev
- E21 - EARTH DRILLING MINING