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Device for making holes in soil
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Patent number 4,785,898
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Issue date Nov 22, 1988
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Institut Gornogo Dela So An SSSR
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Alexandr D. Kostylev
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E21 - EARTH DRILLING MINING
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Reversible percussive action machine
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Patent number 4,697,647
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Issue date Oct 6, 1987
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Institut Gornogo Dela Sibirskogo Otdelenia Akademii Nauk SSSR
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Alexandr D. Kostylev
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E21 - EARTH DRILLING MINING
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Percussive air tool
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Patent number 4,653,596
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Issue date Mar 31, 1987
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Institut Gornogo Dela Sibirskogo Otdelenia An SSSR
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Alexandr D. Kostylev
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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Reversible percussive action machine
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Patent number 4,629,008
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Issue date Dec 16, 1986
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Institut Gornogo Dela Sibirskogo Otdelenia Akademii Nauk SSSR
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Alexandr D. Kostylev
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E21 - EARTH DRILLING MINING
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Machine for driving holes in the ground
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Patent number 4,570,723
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Issue date Feb 18, 1986
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Institut Gornogo Dela Sibirskogo Otdelenia Akademii Nauk SSSR
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Alexandr D. Kostylev
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E21 - EARTH DRILLING MINING
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