AUDICHRON
SIGNAL ACTUATED ELECTRICAL SOUND RECORDING AND REPRODUCING MESSAGE ANNOUNCEMENT APPARATUS USEFUL FOR PERIODIC MESSAGE ANNOUNCEMENTS SUCH AS "TIME OF DAY," CURRENT TEMPERATURE, WEATHER REPORTS, AND THE LIKE; FOR RECORDED ANNOUNCEMENT MESSAGE CIRCUIT TRAFFIC LOAD DETECTOR APPARATUS; AND FOR RELATED EQUIPMENT AND ACCESSORIES
Expired · November 15, 1974 · 73037195 ·