This manual was created by O-E Specialty Manufacturing Co. and outlines how to install the "O-E" Perfect System, which is a Vapor Vacuum heating system.
Thrush System of Hot Water Heating
H. A. Thrush & Company of Peru, Indiana published this book for contractors about the Thrush System of Hot Water Heating. There's no date on it, but it's most likely from the 1930s.
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