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.
A. M. Byers Company Sales Letter
Here's a letter in answer to a question as to how to install radiant heat in a multi-story building. The answer may surprise you. Byers Company made wrought iron pipe. The letter is from 1944.
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