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.
Sullivan's Vacuum Regulator (1949)
Thanks to Bob Polizzi for finding not only photos of T.J. Sullivan's vacuum regulator in place, but also its patent, which explains the entire operation of a device that did a many things.
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