From the OHS PC Database, derived from A Guide to North American Organbuilders, by David H. Fox (Richmond, VA.: Organ Historical Society, 1991). —

Partnership of Frederick W. Roseler and Elmer H. Hunholz in Milwaukee, Wisconsin, 1923-(1950s?); player mechanisms.

Staff: L. J. Hoskins.

Sources: The Diapason September 1930, 31.
Elizabeth Towne Schmitt.

Updated through online information from Joy Anderson (October 19, 2024): Company was in business through the 1970s.