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.
The Dunham Reducing Pressure Valve and Vacuum Pump Governor
This bulletin from C.A. Dunham Co. is from 1916 and features the Dunham Reducing Pressure Valve and Vacuum Pump Governor. Thanks to David Cordes for sharing.
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