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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: Unknown Witnesses: Edgar W. Arnold David Shiverick	Patent Dates: Applied: Oct. 26, 1872 Granted: Apr. 22, 1873 Patent Pictures: [ 1 | 2 | 3 | 4 | 5 | 6 | 7 ] 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. Example found marked "PATAPDFOR" as shown in the photos.

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