73055859
Jun 23, 1975
May 30, 1978
ELECTRONIC SECURITY SYSTEMS-NAMELY, ELECTRONIC DETECTION APPARATUSES, ELECTRONIC SIRENS, CONTACTS, CONTROL EQUIPMENT COMPRISING ENTRY DELAY TIMERS, EXIT DELAY TIMERS, ALARM RESET TIMERS, ALARM LATCHESAND SATELLITE ALARM CONTROLS, POWER SUPPLIES, COMPRISING A.C./D.C. CONVERTERS AND VOLTAGE AND CURRENT REGULATORS, TELEPHONE DIALING INSTRUMENTS, CENTRAL STATION INSTRUMENTS, ACCESS CONTROL INSTRUMENTS COMPRISING CODED KEYBOARDS OR CARDS FOR UNLOCKING DOORS, DE-ENERGISING ALARM SYSTEMS AND OPERATING ELEVATORS OR OTHER DEVICES AND PARTS THEREOF FOR ALL THE ABOVE
Electrical and Scientific Apparatus