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 A. August Gruters, Crefeld, Germany, 1879.

• Patent #220,071; 30 Sep. 1879; organ action.;

Source:

• Information taken from the text of a United States patent.
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