Here is a catalog from Amstan (American Standard), published in 1957, that features their wet heat and cooling products. This document is divided into 5 parts. Many of the products you'll find here are still in the field.
Thanks to John Mills for sharing and scanning this catalog. And thanks to Alex Marx for his help with the file conversions.
This document contains the complete illustrated instructions for installing the Hercules Steam and Hot Water Heating System, a boiler manufactured by Sears, Roebuck and C...
This document contains the manufacturer's instructions for the HB Smith Series M450L Mills Water-Tube Boiler for automatic firing with oil or gas (Steam, Vapor, or Water ...
This document contains the jacket assembly instructions for the HB Smith Series 45 Mills Boiler (circa 1979).