ELECTRONICALLY CONTROLLED BURGLAR ALARM SYSTEMS-NAMELY, SENSORS, RELAYS AND SWITCHING APPARATUSES OF THE PHOTOELECTRIC TYPE; ELECTRONICALLY OPERRATED ALARM SYSTEMS RESPONSIVE TO JAMMING OF RELATIVELY MOVABLE MACHINE PARTS; ELECTRONIC SMOKF ALARM SYSTEMS; ELECTRONIC DOOR CONTROL SYSTEMS; ELECTRONICALLY OPERATED SAFETY APPARATUSES; ELECTRONICALLY OPERATED APPARATUSES FOR SORTING ARTICLES OF MANUFACTURE; RELAYS AND SWITCHING APPARATUSES OF THE CAPACITANCE TYPE; ELECTRONICALLY OPERATED SYNCHRONIZ...

ELECTRONICALLY CONTROLLED BURGLAR ALARM SYSTEMS; ELECTRONIC CONTROL SYSTEMS; RELAYS AND SWITCHING DEVICES OF SYSTEMS; RELAYS AND SWITCHING DEVICES OF THE PHOTOELECTRIC TYPE; ELECTRONICALLY OPERATED ALARM SYSTEMS RESPONSIVE TO JAMMING OF RELATIVELY MOVABLE MACHINE PARTS; ELECTRONIC SMOKE ALARM SYSTEMS; ELECTRONIC DOOR CONTROL SYSTEMS; ELECTRONICALLY OPERATED SAFETY DEVICES; ELECTRONICALLY OPERATED DEVICES FOR SORTING ARTICLES OF MANUFACTURE; RELAYS AND SWITCHING DEVICES OF THE CAPACITANCE TYPE...