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.
Bell & Gossett's Air Control Booster Package
Bell & Gossett's Air Control Booster Package was a product that never really took off. The circulator removed the air from the system. This brochure is from 1966.
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