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Spinal column retainer
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Patent number 6,231,575
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Issue date May 15, 2001
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Martin H. Krag
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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Surgical speed wrench
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Patent number 5,226,906
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Issue date Jul 13, 1993
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Howmedica, Inc.
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John S. Crombie
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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Spinal fixator reduction frame
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Patent number 5,219,349
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Issue date Jun 15, 1993
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Howmedica, Inc.
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Martin H. Krag
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE