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.
D & T "All-in-One" Water Heating System
This device from the D & T Manufacturing Co. is a strainer, pressure-reducing valve, bypass valve, and relief valve, all combined in one unit. Hot stuff for the time!
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