Original old vintage catalog C. A. DUNHAM COMPANY of Chicago, IL. Differential Heating, Concealed Radiators, Unit Heaters. Design of the heater with Relation to the Efficiency of the System, Influence of the Two-Speed Motor on Selection of Heater Sizes, Electric Motor Data, Type V and Type M Heaters, Vacuum Heating System. Disbound from a large 1931 construction book, these unique nine page technical data specifications sheets contain a small amount of residual glue, and pages are loose. Slight damp stain on outer edge. It would make a sensational addition to your industrial engineering library.
- SKU z619
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