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Screw thread coupling
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Patent number 5,060,740
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Issue date Oct 29, 1991
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Sandvik Rock Tools, Inc.
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Faisal J. Yousef
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E21 - EARTH DRILLING MINING
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Screw thread structure
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Patent number 5,056,611
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Issue date Oct 15, 1991
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Galloway Trust
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Faisal J. Yousef
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E21 - EARTH DRILLING MINING
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Carburized high chrome liner
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Patent number 4,568,393
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Issue date Feb 4, 1986
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TRW Inc.
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Robert F. Kane
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR