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.
Danfoss One-Pipe Steam Control Valve Patent
Thanks to Gerry Gill for finding and sharing this patent for the Danfoss 1-PS valve. Note that the vacuum breaker is not yet a part of the valve.
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