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US Patent: 252,436
Metallic Try Square
Patentee: Samuel Darling (exact or similar names) - Providence, RI USPTO Classifications: 33/480 Tool Categories: layout tools : squares : try squares Assignees: None Manufacturer: Not known to have been produced Witnesses: Jacob Kettner John E. Hall	Patent Dates: Applied: Sep. 14, 1881 Granted: Jan. 17, 1882 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen.

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