|
US4713661A
|
|
Transportation vehicle location monitor generating unique audible messages
|
|
US4627100A
|
|
Wide band radio receiver
|
|
US4660193A
|
|
Digital modulation method for standard broadcast FM subcarrier
|
|
US4590519A
|
|
Television signal scrambling/descrambling system
|
|
US4459672A
|
|
Decoder
|
|
US4454509A
|
|
Apparatus for addressably controlling remote units
|
|
US4352992A
|
|
Apparatus for addressably controlling remote units
|
|
US4219821A
|
|
Automatic direction finding system
|
|
US4157505A
|
|
Plural band scanning radio with direct switch of RF amplifying transistors
|
|
US4057760A
|
|
Frequency synthesized scanner having conductive programming elements for channel selection
|
|
US3996522A
|
|
Crystal controlled stepping radio receiver having novel oscillator circuit
|
|
US3996521A
|
|
Signal-seeking radio receiver with band tuning and selecting means
|
|
US3974450A
|
|
Dual frequency FM receiver
|
|
US3974452A
|
|
Battery powered scanning receiver with synchronous power cycling through electrically operable visual indicators
|
|
US3854094A
|
|
Crystal controlled, frequency modulated transmitter
|
|
US3714585A
|
|
Scanning radio having rapid channel skipping capability
|
|
US3665318A
|
|
Radio receiver
|
|
US3135958A
|
|
Automatic radio direction finder
|
|
US3109064A
|
|
Code converting apparatus
|
