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Force transmission device
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Patent number 4,431,348
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Issue date Feb 14, 1984
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Franz Powondra
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E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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2348611
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Patent number 2,348,611
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Issue date May 9, 1944
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E21 - EARTH DRILLING MINING
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2283082
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Patent number 2,283,082
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Issue date May 12, 1942
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E21 - EARTH DRILLING MINING
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2221376
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Patent number 2,221,376
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Issue date Nov 12, 1940
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E21 - EARTH DRILLING MINING
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1620913
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Patent number 1,620,913
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Issue date Mar 15, 1927
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E21 - EARTH DRILLING MINING
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1414541
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Patent number 1,414,541
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Issue date May 2, 1922
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E21 - EARTH DRILLING MINING
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1374510
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Patent number 1,374,510
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Issue date Apr 12, 1921
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E21 - EARTH DRILLING MINING
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1370140
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Patent number 1,370,140
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Issue date Mar 1, 1921
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E21 - EARTH DRILLING MINING