Duplex needle
United States Patent 2137132

Inventors:
Cooley, Kenneth L.
Publication Date:
11/15/1938
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Assignee:
Cooley, Kenneth L.
Primary Class:
604/83
Other Classes:
604/274, 607/92, 27/24.100
International Classes:
A61B17/34; A61M1/00; A61M1/02; A61M1/36; A61M5/158; A61M5/14