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Tracheal tube
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Patent number 4,979,505
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Issue date Dec 25, 1990
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Everard F. Cox
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Static tracheostomy tube
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Patent number 4,471,776
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Issue date Sep 18, 1984
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Everard F. Cox
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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Static tracheostomy tube
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Patent number 4,340,046
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Issue date Jul 20, 1982
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Everard F. Cox
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE