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Walking substructure device
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Patent number 5,921,336
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Issue date Jul 13, 1999
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Parker Drilling Company
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Lowell M. Reed
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B62 - LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
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Automatic drilling system
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Patent number 4,875,530
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Issue date Oct 24, 1989
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Parker Technology, Inc.
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Tommy S. Frink
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E21 - EARTH DRILLING MINING
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Dual cluster crown block
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Patent number 4,796,863
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Issue date Jan 10, 1989
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Parco Mast and Substructures, Inc.
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Lowell M. Reed
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B66 - HOISTING LIFTING HAULING
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Telescoping derrick
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Patent number 4,590,720
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Issue date May 27, 1986
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Parco Mast and Substructure, Inc.
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Lowell M. Reed
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E04 - BUILDING
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