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.
Trap Bushing for Radiators (1919)
Here is a patent for a trap bushing for radiators from F.J. Vaux in January 3, 1922. This one could easily stump you if you didn't know it was in there. Thanks to Steve Pajek for sharing this patent with us.
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