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.
In-Air-Rid Vent Patent
The In-Air-Rid Vent is one of the finest steam-heating products ever made. In this patent, L.M. Stadelhofer says of his radiator and air valve, "My invention relates to new and useful improvements in valves for venting air from heating radiators." Thanks to Gerry Gill for all his hard work in coming up with the patent.
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