71585243
Sep 23, 1949
Apr 8, 1952
CONTROLLING DEVICES, EMPLOYING ELECTRIC CIRCUIT CONTROLLING SWITCHES; NAMELY, [ VACUUM OPERATED ELECTRIC SWITCHES, ] PRESSURE OPERATED ELECTRIC SWITCHES [ , FLOAT OPERATED ELECTRIC SWITCHES, MECHANICALLY OPERATED ELECTRIC SWITCHES AND MAGNETICALLY OPERATED ELECTRIC SWITCHES, AND PARTS THEREOF INCLUDING MERCURY SWITCHES ]
Housewares and Glass