Alert device for attaching to radio receiving sets
United States Patent 2744194
US Patent References:
Automatic short wave converter
- - 2033492

Thermionic vacuum tube circuit
- - 2055921

Vacuum tube circuit
- - 2104844

Remote control system
- - 2340798

Radio alarm system
- - 2353499


Inventors:
Martin, Auerbach
Publication Date:
05/01/1956
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Assignee:
Martin, Auerbach
Primary Class:
455/228
Other Classes:
455/348
International Classes:
G08B27/00
US Patent References:
2367378Radio alarm system
2447156Radio control system
2531416Control circuit for radio receivers
2552331Electric clock fire alarm
Foreign References:
GB526239A