73000107
Sep 4, 1973
Nov 19, 1974
RADIO RECEIVERS; RADIO TRANSMITTERS; RADIO TRANCEIVERS; AUTOMATIC SCANNING RADIOS; MANUALLY TUNED RADIOS; WEATHER RADIOS; TONE ALERT APPARATUS INCLUDING TONE GENERATORS, TONE TRANSMITTERS AND TONE DECODING RECEIVERS, CRYSTALS AND ELECTRONIC TEST INSTRUMENTS FOR MEASURING THE FREQUENCY OF A RADIO FREQUENCY SIGNAL, D.C. POWER SUPPLIES, AND MICROPHONES
Electrical and Scientific Apparatus