Here are circa-1909 patents for H.K & I.Z. Kriebel's air and vacuum controlling device, as well as their system of steam heating and air and vacuum controlling device, automatic air valve, and check valve. Thanks to Gerry Gill for finding and sharing these patents.
The Improved Webster Type "R" System of Steam Heating is a service bulletin from Warren Webster and Company (The Pioneers of Vacuum Steam Heating), established in 1888.
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.
Here is the original Installation and Operating Instructions and Parts List for The H.B. Smith Company's Oil Fired Cast Iron Hot Water Boilers (No. OHB-13W). This is esti...