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Hoffman Venting Valves for Every Purpose (1918)

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This book, Hoffman Venting Valves for Every Purpose, was from the Hoffman Specialty Co. in 1918. It includes a lot of information about Hoffman valves for heating systems. You'll also find a discussion of Hoffman's Equalizing Loop, which came before their Differential Loop. Thanks to Frank "Steamhead" Wilsey for finding and sharing this document with us. 

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