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.
Johns-Manville Improved Asbestocel Advertisement
Back in the day (1924), when asbestos was still a good thing, this ad appeared. It makes an excellent case for why pipes and boilers need to be insulated.
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