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.
Plumber and Steam Fitter Magazine
Here is the June 17, 1921 issue of Plumber and Steam Fitter Magazine that contains some interesting articles and advertisements.
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The American Society of Heating and Ventilating Engineers Guide (1929) - Hot Water Heating Systems and Piping
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