Public address housing assembly
United States Patent 2744584
US Patent References:
Loud-speaker
- - 1738955

Loud speaker
- - 1823512

Diaphragm
- - 1843367

Telephone system and apparatus
- - 1905215

Loud speaker cone
- - 1944861


Inventors:
Hellon, James B.
Publication Date:
05/08/1956
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Assignee:
Hellon, James B.
Primary Class:
181/150
Other Classes:
181/151
International Classes:
H04R1/02
US Patent References:
2157609Ventilator
2165637Roof speaker mounting
2282384Flush wall mounting for radio units
2581251Telephone booth
2619893Motor-driven ventilating unit mounting
Foreign References:
FR908709A