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US Patent: 407,515
Draftsman's Protractor
Patentee: William W. Duffield (exact or similar names) - Detroit, MI USPTO Classifications: 33/1M, 33/1R Tool Categories: layout tools : protractors Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: May 02, 1889 Granted: Jul. 23, 1889 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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