Patent US3827440 - CHECK-VALVE FOR TRACHEOTOMY TUBES

Citing Patent	Filing date	Issue date	Original Assignee	Title
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US4538607	6 Feb 1984	3 Sep 1985	AB Fixfabriken	Tracheostomy valve
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US6668831	20 Feb 2001	30 Dec 2003		Appliance for a stoma

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