2004-10-30/2019-02-11 - From the OHS PC Database, derived from A Guide to North American Organbuilders, rev. ed., by David H. Fox (Organ Historical Society, 1997). — In Baltimore, Maryland, 1895–1898; in Williamsport, Pennsylvania, by 1900. Patent #642,827; 6 Feb. 1900; pneumatic valve. Source: Information taken from the text of a United States patent. Piano and Organ Purchaser-s Guide, Purchaser-s Guide to the Music Industries, (published by Music Trades, New York).
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