2004-10-30/2019-10-19 - From the OHS PC Database, derived from A Guide to North American Organbuilders,by David H. Fox (Organ Historical Society, 1991). — Patent awarded to Martin J. Olson, Ishpeming, Michigan, 1913. Patent #1,051,156; January 21, 1913; organ tuner's keyboard player. Source: Information taken from the text of the United States patent listed above.
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