HEATING SYSTEMS AND COMPONENTS THEREFOR 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 'e':37 'electr':10,13 'element':12 'extens':19 'heat':1,11,31 'insul':21 'jack':26 'lead':20 'one':7 'pipe':38 'plug':23 'record':17 'shape':35 'socket':24 'structur':34 'system':2,28 'temperatur':15 'therefor':5 'thermocoupl':22 'treat':32 'use':29 'weld':33

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