2004-10-30/2019-11-02 - 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 Almarin Trowbridge Jr., Boston, Massachusetts, 1877. Patent #194,017; August 7, 1877; stop action. Source: Information taken from the text of the United States patent listed above.
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