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Nelson B. Delavan was born in 1897 in Norwich, New York. In 1936 Nelson formed Delavan Engineering. The goal of the company was to be manufacturer’s representatives for producers of electrical and mechanical equipment in Iowa, Nebraska, Minnesota and the Dakotas. In 1941, Nelson founded Delavan Manufacturing Company in Des Moines, Iowa to produce high precision nozzles for oil burners, agricultural spraying equipment, and special components for aircraft engines.