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.
McDonnell & Miller #11 Switch Patent
Here is a United States Patent for McDonnell & Miller's #11 Switch, dated October 28, 1941. Thanks to Gerry Gill for finding and sharing this one.
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