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Percussive tool
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Patent number 4,690,225
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Issue date Sep 1, 1987
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Institut Gornogo Dela Sibirskogo Otdelenia Akademii Nauk SSSR
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Konstantin K. Tupitsyn
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Pneumatic impact devices
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Patent number 4,070,948
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Issue date Jan 31, 1978
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Khaim Berkovich Tkach
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E21 - EARTH DRILLING MINING
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Pneumatic percussive power tool
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Patent number 3,974,885
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Issue date Aug 17, 1976
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Boris Vasilievich Sudnishnikov
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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Impact action mechanism
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Patent number 3,941,101
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Issue date Mar 2, 1976
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Alexandr Dmitrievich Kostylev
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F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS