G. H. Crosby Indicator, Patent Model
National Museum of American History

G. H. Crosby Indicator, Patent Model

Crosby, George H. · 1879

brass, wood, string (overall material)
National Museum of American History
CC0 — Public Domain
National Museum of American History

This indicator was filed to the U.S. Patent Office with the application for patent no. 219149 issued to G. H. Crosby, September 2, 1879.

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