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Pipe handling device
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Patent number 6,543,551
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Issue date Apr 8, 2003
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The Charles Machine Works, Inc.
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Darrel W. Sparks
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B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
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Anchor assembly
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Patent number 6,216,803
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Issue date Apr 17, 2001
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The Charles Machine Works, Inc.
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Arthur D. Deken
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E21 - EARTH DRILLING MINING
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Pipe handling device
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Patent number 6,085,852
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Issue date Jul 11, 2000
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The Charles Machine Works, Inc.
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Darrel W. Sparks
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B65 - CONVEYING PACKING STORING HANDLING THIN OR FILAMENTARY MATERIAL
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Drill pipe breakout device
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Patent number 5,267,621
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Issue date Dec 7, 1993
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The Charles Machine Works, Inc.
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Arthur D. Deken
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E21 - EARTH DRILLING MINING
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Soft excavator
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Patent number 5,212,891
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Issue date May 25, 1993
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The Charles Machine Works, Inc.
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Kenneth W. Schuermann
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Radial diaphragm pump
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Patent number 4,963,075
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Issue date Oct 16, 1990
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The Charles Machine Works, Inc.
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Philip E. Albertson
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F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
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Coupling for earth boring units
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Patent number 4,422,794
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Issue date Dec 27, 1983
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The Charles Machine Works, Inc.
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Arthur D. Deken
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E21 - EARTH DRILLING MINING