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Continuous mining machine
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Patent number 4,363,519
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Issue date Dec 14, 1982
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Joy Manufacturing Company
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Thomas E. Howard
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E21 - EARTH DRILLING MINING
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3879088
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Patent number 3,879,088
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Issue date Apr 22, 1975
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E21 - EARTH DRILLING MINING
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3873159
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Patent number 3,873,159
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Issue date Mar 25, 1975
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E21 - EARTH DRILLING MINING
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3317245
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Patent number 3,317,245
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Issue date May 2, 1967
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E21 - EARTH DRILLING MINING
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2800968
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Patent number 2,800,968
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Issue date Jul 30, 1957
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E21 - EARTH DRILLING MINING
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2800969
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Patent number 2,800,969
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Issue date Jul 30, 1957
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E21 - EARTH DRILLING MINING
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2340533
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Patent number 2,340,533
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Issue date Feb 1, 1944
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E21 - EARTH DRILLING MINING
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2282749
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Patent number 2,282,749
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Issue date May 12, 1942
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E21 - EARTH DRILLING MINING
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1786244
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Patent number 1,786,244
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Issue date Dec 23, 1930
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E21 - EARTH DRILLING MINING
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1664383
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Patent number 1,664,383
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Issue date Mar 27, 1928
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E21 - EARTH DRILLING MINING