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Hydraulic jackhammer
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Patent number 5,117,923
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Issue date Jun 2, 1992
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Sulzer Brothers Limited
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Wolfgang Wuhrer
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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Liquid inertia tool
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Patent number 4,484,638
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Issue date Nov 27, 1984
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Joe E. West
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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Hydraulically operated impact motor
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Patent number 4,349,075
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Issue date Sep 14, 1982
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Atlas Copco Aktiebolag
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Stig R. Henriksson
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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Rotary percussion hydraulic drilling machine
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Patent number 4,291,771
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Issue date Sep 29, 1981
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Societe d'Etude et de Construction de Machines pour Toutes Industries S.E.C.O...
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Raymond J. Perraud
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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Hydraulic impact device
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Patent number 4,231,434
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Issue date Nov 4, 1980
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Edgar J. Justus
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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Hydraulic percussion apparatus
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Patent number 4,165,788
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Issue date Aug 28, 1979
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Roger Montabert
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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Hydraulic powered rock drill
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Patent number 4,157,121
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Issue date Jun 5, 1979
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Chicago Pneumatic Tool Co.
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Lester A. Amtsberg
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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Universal hydraulic impact tool
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Patent number 4,082,471
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Issue date Apr 4, 1978
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Imperial-Eastman Corporation
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Jan A. Hiszpanski
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Hydraulic rock drill
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Patent number 4,039,033
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Issue date Aug 2, 1977
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Oy Tampella AB
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Pekka M. Salmi
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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Impact tool
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Patent number 4,034,817
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Issue date Jul 12, 1977
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Nippon Pneumatic Manufacturing Co., Ltd.
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Hiroshi Okada
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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Hydraulic rock drill system
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Patent number 3,995,700
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Issue date Dec 7, 1976
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Gardner-Denver Company
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James R. Mayer
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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Strain gauge apparatus
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Patent number 3,948,089
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Issue date Apr 6, 1976
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Westinghouse Electric Corporation
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Bevil J. Shaw
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G01 - MEASURING TESTING
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3887019
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Patent number 3,887,019
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Issue date Jun 3, 1975
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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3872934
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Patent number 3,872,934
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Issue date Mar 25, 1975
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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3866690
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Patent number 3,866,690
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Issue date Feb 18, 1975
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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3866694
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Patent number 3,866,694
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Issue date Feb 18, 1975
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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3857448
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Patent number 3,857,448
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Issue date Dec 31, 1974
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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3851713
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Patent number 3,851,713
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Issue date Dec 3, 1974
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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3827507
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Patent number 3,827,507
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Issue date Aug 6, 1974
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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3822633
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Patent number 3,822,633
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Issue date Jul 9, 1974
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B06 - GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
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3805896
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Patent number 3,805,896
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Issue date Apr 23, 1974
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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3803983
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Patent number 3,803,983
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Issue date Apr 16, 1974
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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3800664
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Patent number 3,800,664
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Issue date Apr 2, 1974
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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3796271
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Patent number 3,796,271
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Issue date Mar 12, 1974
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E21 - EARTH DRILLING MINING