2004-10-30/2019-11-20 - From the OHS PC Database, derived from A Guide to North American Organbuilders, rev. ed., by David H. Fox (Organ Historical Society, 1997). - Patents awarded to Joseph Schwertner, Detroit, Michigan and New York City, New York, 1890s-1913; associated with Heerwagen Co. Patent #465,390; December 15, 1891; combination. Patent #539,595; May 21, 1895; reed pipe. Patent #1,082,655; December 30, 1913; coupler. Source: Information taken from the text of the United States patents listed above.
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