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.
Honeywell Control Systems for Radiant Panel Heating
This brochure about Honeywell Control Systems for Radiant Panel Heating from the Minneapolis-Honeywell Regulator Company outlines their approach to radiant heating system control in 1950.
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