2004-10-30/2019-10-16 - 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 Paul Walcker, Frankfort on the Oder, Germany, 1927. Patent #1,622,931; March 29, 1927; organ. Patent #1,650,555; November 22, 1927; electric action. Source: Information taken from the text of the United States patents listed above.
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