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.
Gold's Mattress Radiator Patent
Here is the patent for Stephen J. Gold's "mattress" radiator. This is the first radiator that was a commercial success in America. Thanks to Gerry Gill for finding and sharing this patent with us.
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