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Portion of a drill bit
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Patent number D525995
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Issue date Aug 1, 2006
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Sandvik Intellectual Property AB
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Fredrik Bjork
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D15 - Machines not elsewhere specified
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Excavating tool cutting insert
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Patent number 5,161,859
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Issue date Nov 10, 1992
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Santrade Limited
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Kenneth L. Larsson
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B28 - WORKING CEMENT, CLAY, OR STONE
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Drill string element
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Patent number 4,961,469
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Issue date Oct 9, 1990
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Sandvik AB
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Kenneth L. Larsson
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E21 - EARTH DRILLING MINING
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Excavating tool cutting insert
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Patent number 4,938,538
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Issue date Jul 3, 1990
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Santrade Limited
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Kenneth L. Larsson
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B28 - WORKING CEMENT, CLAY, OR STONE
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Threaded coupling
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Patent number 4,861,209
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Issue date Aug 29, 1989
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Sandvik AB
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Kenneth L. Larsson
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E21 - EARTH DRILLING MINING