73131245
Jun 21, 1977
Aug 1, 1978
POWER SUPPLIES-NAMELY, BATTERIES, RECTIFIERS/VOLTAGE/CURRENT REGULATORS AND TRANSFORMERS; CONTROL PANELS-NAMELY, ELECTRONIC APPARATUSES ADAPTED TO ELECTRICALLY MONITOR A PREDETERMINED ACTIVITY AND ACTIVATE A BURGLAR ALARM; SIREN SPEAKERS; AND ELECTRONIC SIREN DRIVERS-NAMELY, TONE GENERATORS AND AMPLIFIERS ADAPTED TO BE USED FOR SIRENS
Electrical and Scientific Apparatus