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.
Johnson Vapor Heating Systems Bulletin
Johnson Vapor Heating Systems was of the more obscure systems from the Turn of the Century. This bulletin from Johnson Vapor Heating Co. outlines how the system works. Thanks to Alex Marx for sharing this rare document with us.
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