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US Patent: 680,830
Square
Patentee: James A. Wray (exact or similar names) - Chicago, IL USPTO Classifications: 403/323 Tool Categories: layout tools : squares : carpenter squares Assignees: None Manufacturer: Not known to have been produced Witnesses: John L. Jackson Albert H. Adams	Patent Dates: Applied: Jul. 05, 1900 Granted: Aug. 20, 1901 Patent Pictures: [ 1 | 2 ] USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen.
Description: Tongue and groove arrangement with a cut out screw to secure the pieces together.

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