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.
Dunham Boiler-Return Trap Patent (1922)
Here is a patent issued to O.G. Johnson for the Dunham Return Trap from April 2, 1922. Thanks to Gerry Gill for finding and sharing this patent with us.
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