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.
Kriebel Vapor Heating Patents
Here are circa-1909 patents for H.K & I.Z. Kriebel's air and vacuum controlling device, as well as their system of steam heating and air and vacuum controlling device, automatic air valve, and check valve. Thanks to Gerry Gill for finding and sharing these patents.
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