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US Patent: 142,557
Try-Square Improvement in Try- Squares
Patentee: William H. Cooper (exact or similar names) - Lowell, MA USPTO Classifications: 33/427 Tool Categories: layout tools : squares layout tools : squares : square attachments Assignees: None Manufacturer: Not known to have been produced Witnesses: Albert M. Moore J. F. Frye	Patent Dates: Applied: Jun. 09, 1873 Granted: Sep. 09, 1873 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Steve Gosselin

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