Perfex Series 155 Magic Dial Thermostat
Here are photos of a circa-1944 Perfex Series 155 Magic Dial Thermostat, as well as the instruction manual.
Vari-Vac Differential Heating System
Here is information from MEPCO (Marshall Engineered Products Co.) about the Vari-Vac Differential Heating System. Thanks to Brad White for finding and sharing this information with us.
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