David Crosthwait
In 1913 Crosthwait moved to Marshalltown, Iowa where he began working for the Durham Company, designing heating installations. In 1925 he was named the director of the research department, overseeing a staff of engineers and chemists.
His research concerned heating and ventilating and in the coming years he obtained 39 patents for various devices including heating systems, vacuum pumps, refrigeration methods and processes and temperature regulating devices.His most famous creation was the heating system for New York’s famous Radio City Music Hall.
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