Title:
HEADSET DEVICE
United States Patent 3547219

Inventors:
Bothos, Costas
Publication Date:
12/15/1970
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Assignee:
Costas, Bothos
Primary Class:
181/135
Other Classes:
D14/205
International Classes:
A61B7/02; A61B7/00; G10K13/00; A61B7/02




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