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

'cabl':18 'compon':4 'compris':6 'contactor':14 'control':16 'electr':10,13 'element':12 'extens':19 'heat':1,11,31 'i.e':36 'insul':21 'jack':26 'lead':20 'one':7 'pipe':37 'plug':23 'record':17 'shape':35 'socket':24 'structur':34 'system':2,28 'temperatur':15 'thereof':5 'thermocoupl':22 'treat':32 'use':29 'weld':33

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