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US Patent: 161,392
Protractor
Patentee: Alvin H. Dodd (exact or similar names) - New York, NY USPTO Classifications: 33/471 Tool Categories: metalworking tools : machinist tools : measuring tools : protractors layout tools : protractors Assignees: None Manufacturer: Not known to have been produced Witnesses: Charles H. Nash T. B. Mosher	Patent Dates: Applied: Jan. 18, 1875 Granted: Mar. 30, 1875 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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