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US Patent: 315,388
Plotter For Tinners' Use
Patentee: Christian D. Cowgill (exact or similar names) - Terre Haute, IN USPTO Classifications: 33/426 Tool Categories: layout tools : squares layout tools : bevels Assignees: None Manufacturer: Not known to have been produced Witnesses: Baskin E. Rhoads Elmer F. Williams Fred G. Dietrich Wm. Bagger	Patent Dates: Applied: Dec. 10, 1884 Granted: Apr. 07, 1885 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: This is a specialized square and bevel gage for use by tinsmiths. It can easily figure and mark the angles for any regular polygon.

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