INSTRUMENTS FOR CONTROLLING THE OPERATION OF HEATING, COOLING, AND REFRIGERATION APPARATUS-NAMELY, TEMPERATURE RESPONSIVE, FLAME RESPONSIVE, AND PRESSURE RESPONSIVE SWITCHING DEVICES, ELECTROTHERMOSTATIC VALVES, AND ELECTROTHERMAL AND CHRONOGRAPHIC TIME SWITCHES

'apparatus':12 'apparatus-nam':11 'chronograph':28 'control':3 'cool':8 'devic':22 'electrotherm':26 'electrothermostat':23 'flame':16 'heat':7 'instrument':1 'name':13 'oper':5 'pressur':19 'refriger':10 'respons':15,17,20 'switch':21,30 'temperatur':14 'time':29 'valv':24

ELECTRIC IGNITERS, ELECTROMAGNETIC VALVES, ELECTRICAL RELAYS AND TRANSFORMERS

'electr':1,5 'electromagnet':3 'ignit':2 'relay':6 'transform':8 'valv':4

WHITE-RODGERS

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