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; ELECTRONICALLY OPERATED SYNCHRONIZING DEVICES FOR SYNCHRONIZING RELATIVE MOVEMENTS OF PARTS; ELECTRONIC SCANNING SYSTEMS FOR SUPERVISING FABRICS; ELECTRONIC CONTROL SYSTEMS FOR SUPERVISING THE CONTINUTIY OF TEXTILE AND OTHER THREADS; ELECTRONIC CONTROL SYSTEMS FOR SUPERVISING THE CONTINUITY OF TEXTILE AND OTHER WEBS; ELECTRONIC FIRE ALARM SYSTEMS; ELECTRONIC SYSTEMS FOR SUPERVISING THE OPERATION OF FILTERING DEVICES; LIQUID LEVEL CONTROL SYSTEMS; RELAYS AND SWITCHING DEVICES OF THE RESISTIVE TYPE; TIME DELAY RELAYS; ELECTRONICALLY OPERATED WELDING CONTROL SYSTEMS