2004-10-30/2020-04-09 - 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 Felix Zebrowski, Chicago, Illinois, 1904. Patent #759,338; 10 May 1904; pipe organ. Source: Information taken from the text of one or more United States patents.
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