Breathing tube
United States Patent 2073335

Inventors:
Karl, Connell
Publication Date:
03/09/1937
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Assignee:
Karl, Connell
Primary Class:
138/122
Other Classes:
156/143, 264/DIG.052, 174/47, 128/204.180
International Classes:
A61M16/08; A62B9/04; A62B9/00