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.
Hoffman Boiler Return Trap Patent
This circa-1936 patent is for the Hoffman Specialty Company's boiler return trap for heating systems. Thanks to Gerry Gill for finding this patent, and for sharing it with us.
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