71577440
Apr 20, 1949
Aug 26, 1952
[ PHOTO-ELECTRIC RELAYS; CAPACITY RELAYS; ] ELECTRONIC LIQUID LEVEL CONTROLS AND ELECTRONIC REFRIGERATION COIL ICE ACCUMULATION CONTROLS, COMPRISED OF A POWER INLET, ELECTRONIC TUBES, TRANSFORMER, AND DEPTH REGULATING ELECTRODES [ ; AND ELECTRIC SWITCHES IN THE FORM OF MAGNETIC CONTACTORS ]
Housewares and Glass