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US Patent: 138,113
Improvement in Try Squares
Patentee: Wilbur F. Arnold (exact or similar names) - Winthrop, CT USPTO Classifications: 33/480 Tool Categories: layout tools : squares : try squares Assignees: None Manufacturer: Not known to have been produced Witnesses: Edgar W. Arnold David Shiverick	Patent Dates: Applied: Oct. 26, 1872 Granted: Apr. 22, 1873 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen.
Description: User adjustable try square. A single screw-cam locks the blade into place.

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