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.
Moline System of Heating Booklet and Patents
The Moline System of Heating was a famous vapor heating system, named for the Illinois city. There is no date on this booklet, but it is probably from around 1915. Special thanks to Gerry Gill for the hard work he put into finding the Moline patents, which are also here.
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