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.
Trap Bushing for Radiators (1919)
Here is a patent for a trap bushing for radiators from F.J. Vaux in January 3, 1922. This one could easily stump you if you didn't know it was in there. Thanks to Steve Pajek for sharing this patent with us.
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