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Tooth cleaning instrument
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Patent number 4,696,644
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Issue date Sep 29, 1987
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Sven K. L. Goof
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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Electrosurgical apparatus
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Patent number 4,580,562
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Issue date Apr 8, 1986
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Sven K. L. Goof
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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Electric contact device
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Patent number 4,374,374
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Issue date Feb 15, 1983
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Sven K. L. Goof
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H01 - BASIC ELECTRIC ELEMENTS
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Rod shaped hand-tool
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Patent number 4,036,311
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Issue date Jul 19, 1977
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Sven Karl Lennart Goof
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE