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.
The Dunham Air-Line Service Valve and Its Application
This circa-1916 bulletin from C.A. Dunham Co. describes Dunham's heating product offering for a system to compete with Andrew Paul's heating system.
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