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US Patent: 670,677
Draftsman's Protractor
Patentee: Duane J. Kelsey (exact or similar names) - New Haven, CT USPTO Classifications: 33/418 Tool Categories: metalworking tools : machinist tools : measuring tools : protractors layout tools : protractors Assignees: None Manufacturer: Not known to have been produced Witnesses: Charles J. Brooks George D. Lambert Hosmer Kelsey	Patent Dates: Applied: Jul. 31, 1900 Granted: Mar. 26, 1901 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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