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US Patent: 411,741
Protractor
Patentee: Charles E. W. Dow (exact or similar names) - Providence, RI USPTO Classifications: 33/403, 74/10R Tool Categories: metalworking tools : machinist tools : measuring tools : protractors layout tools : protractors Assignees: Darling, Brown & Sharpe - Providence, RI Manufacturer: Not known to have been produced Witnesses: John S. Lynch Socrates Scholfield	Patent Dates: Applied: Dec. 03, 1888 Granted: Sep. 24, 1889 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Brown & Sharpe Mfg. Co.

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