GRL

ELECTRICAL APPARATUS-NAMELY, POWER PACKS FOR CAMERAS, INVERTERS, SLATE SYSTEMS FOR MOTION PICTURE CAMERAS WHICH SIMULTANEOUSLY PRODUCE A FLASH AND A SOUND TO PERMIT SYNCHRONIZATION OF A FILM SOUND TRACK WITH ACTION, FLOOD LIGHTS, INVERTER FREQUENCY TEST SYSTEMS FOR TESTING THE FREQUENCY OF THE SIGNAL PRODUCED BY AN INVERTER; AND CAMERAS