O-E Vapor System Manual
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.
Hubbard's Radiator Valve Patent
Wait until you see this wonderful invention from 1922! We wish they still made these. This is the patent for M.G. Hubbard's radiator valve for steam heating. Thanks to Gerry Gill for finding it.
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