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.
Data for Heating Engineers and Architects for the Design of Vapor Heating Systems
This Data for Heating Engineers and Architects for the Design of Vapor Heating Systems booklet is from The Trane Company, published in 1917.
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