2004-10-30/2019-04-29 - From the OHS PC Database, derived from A Guide to North American Organbuilders, rev. ed., by David H. Fox (Richmond, Va.: Organ Historical Society, 1997). - Hagerstown, Maryland. Patent #1,898,240; February 21, 1933; valve. * Patent #1,912,253; May 30 1933; valve.* Patent #1,907,176; May 2, 1933; electromagnetic valve.** *Assigned to M.P. Moller. **Assigned to W.H. Reisner. Information from the text of each patent. -Ed. Source: Information from the text of United States patents.
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