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.
Kriebel Hot Water System
Kriebel was very involved with steam heating and they made a device that worked in a similar way to Honeywell's Heat Generator. Thanks to Gerry Gill for finding this patent.
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