72438693
Oct 18, 1972
Dec 25, 1973
HEATING SYSTEMS AND COMPONENTS THEREOF, COMPRISING ONE OR MORE ELECTRICAL HEATING ELEMENTS, ELECTRICAL CONTACTOR, TEMPERATURE CONTROLLER, RECORDER, CABLES, EXTENSION LEADS, INSULATION, THERMOCOUPLES, PLUGS, SOCKETS, AND JACKS; THE SYSTEM USED FOR HEAT TREATING WELDED STRUCTURAL SHAPES, I.E. PIPE
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