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.
Illinois Vapor Heating Systems
This document is from the Illinois Engineering Co. and provides information about Illinois Heating Systems, packless radiator valves, thermostatic traps, the standard vacuum heating system, and vapor heating systems. You can find the Illinois Heating Systems circa-1923 catalog here. Thanks to Patrick Linhardt for finding, scanning and sharing this with us.
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