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). — Patent awarded to Wilhelm T. F. Weigle, Stuttgart, Germany, 1894. Patent #520,344; 22 May 1894; pipe. Source: Information taken from the text of a United States patent.
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