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.
Amstan Wet Heat and Cooling Products (1957) - Part 2
Here is a catalog from Amstan (American Standard), published in 1957, that features their wet heat and cooling products. This document is divided into 5 parts. Many of the products you'll find here are still in the field.
Thanks to John Mills for sharing and scanning this catalog. And thanks to Alex Marx for his help with the file conversions.
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