73792267
Apr 10, 1989
Dec 25, 1990
COMPUTER PROGRAMS FOR USE IN ANALYZING THE QUALITY AND EFFICIENCY OF LIGHTING; TRANSFORMERS FOR LAMPS; ELECTRONIC TIMER SWITCHES; LIGHT LEVEL CONTROLS; AND IGNITORS AND BALLASTS FOR LAMPS AND LIGHTING FIXTURES, FOR COMMERCIAL OR INSTITUTIONAL USE; MOVIE PROJECTORS
Electrical and Scientific ApparatusLIGHTING SYSTEMS, COMPRISING, SOCKETS FOR SOURCES OF ILLUMINATION; SCREENS AND COVERINGS FOR CONTROLLING AND GUIDING OF LIGHT; OPAQUE, REFLECTING, LIGHT-ABSORBING OR LIGHT-TRANSMITTING ENCLOSURES AND ENCLOSURE PARTS FOR LIGHTS AND LAMPS; TRACKS FOR LIGHTS; LIGHT SUSPENSIONS; DRAW PULLS; CANOPIES; ILLUMINATION ARMATURES; AND PROJECTOR LAMPS; RADIATORS; ELECTRIC AND GAS DISCHARGE LIGHTS, LAMPS, LIGHTING FIXTURES, LUMINAIRES, AND PARTS THEREOF; AND ELECTRIC ILLUMINATED SIGNS, FOR COMMERCIAL OR INSTITUTIONAL USE
Environmental Control Apparatus