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.
History of the Water Feeder and Low-Water Cutoff
This is the History of the Water Feeder and Low-Water Cutoff, as told by E. N. McDonnell of McDonnell & Miller to his sales people. No date, but probably written in the 1940s.
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