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.
Milwaukee Valve Company Bulletin (1935)
Here is some very good literature on the Milwaukee Valve Company's vapor heating product offering from 1935, including the MILVACO Air Line Valve, the Type "M" Boiler Return Trap, the Type "V" Thermostatic Trap, MILVACO Quick Vents, MILVACO Automatic Air Valves, and the MILVACO Air Eliminator or Float Vent. Thanks to Patrick Linhardt for scanning and sharing.
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