Title:
ELECTRONIC CALLING AND REPLY SYSTEM
Document Type and Number:
United States Patent 3441858

Inventors:
Graham, Gordon
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Sponsored by:
Flash of Genius
Publication Date:
04/29/1969
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Assignee:
Gordon, Graham
Primary Class:
340/502
Other Classes:
340/904, 340/7.220, 455/521, 340/7.500, 340/902
International Classes:
G08B1/08; G08B1/00; G08G1/08; H04B7/20
US Patent References:
2475578Radio and visual warning device
2577751Remote supervisory radio signaling system
2943188Transmitter-receiver for radio location
2979706Radio warning system
3020548Portable radio direction finder
3099797Radio receiving set for motor cars
3123801
3134945Combination vehicle radio and portable radio
3233217Vehicle signal device
3251033Motor vehicle emergency switch and signal


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