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3877147
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Patent number 3,877,147
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Issue date Apr 15, 1975
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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3872708
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Patent number 3,872,708
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Issue date Mar 25, 1975
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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3817077
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Patent number 3,817,077
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Issue date Jun 18, 1974
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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2057440
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Patent number 2,057,440
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Issue date Oct 13, 1936
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...