PHOTOBELL

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 SYNCHRONIZING APPARATUSES FOR SYNCHRONIZING RELATIVE MOVEMENTS OF PARTS; ELECTRONIC SCANNING SYSTEMS FOR SUPERVISING FABRICS; ELECTRONIC CONTROL SYSTEMS FOR SUPERVISING THE CONTINUITY 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 APPARATUSES; LIQUID LEVEL CONTROL SYSTEMS; RELAYS AND SWITCHING APPARATUSES OF THE RESISTIVE TYPE; TIME DELAY RELAYS; AND ELECTRONICALLY OPERATED WELDING CONTROL SYSTEMS