73050647
Apr 28, 1975
Oct 3, 1978
ELECTRICAL APPARATUS FOR REMOTE CONTROL OF LIGHTING, HEATING AND VENTILATION
Electrical and Scientific ApparatusLIGHTING, HEATING, AND VENTILATING SYSTEMS, COMPRISING PRINCIPALLY LIGHTING FIXTURES, FURNACES, STOVES, WATER HEATERS, WATER STORAGE TANKS, REFRIGERATORS AND AIR CONDITIONERS
Environmental Control ApparatusSERVICES IN CONSTRUCTION, INSTALLATION, MAINTENANCE AND REPAIRING ELECTRICAL DEVICES USED IN CONTROLLING LIGHTING, HEATING AND VENTILATION
Building Construction and Repair