Headphone assembly
United States Patent 3272926
US Patent References:
Hard shell liquid seal earmuff with isolated inner close coupling ear shell
- - 2989598
Hard shell liquid seal earmuff with isolated inner close coupling ear shell
- - 2989598
Inventors:
Falkenberg, Gustave F.
Publication Date:
09/13/1966
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Export Citation:
Assignee:
DIMENSIONAL PRODUCTS INC
Primary Class:
Other Classes:
381/370, D14/205
International Classes:
H04R1/10