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US Patent: 523,500
Steel Square
Patentee: John George Zuck (exact or similar names) - Cleveland, OH USPTO Classifications: 33/456 Tool Categories: layout tools : squares Assignees: None Manufacturer: Unknown Witnesses: Wm. A. Skinkle Cornelia A. Skinkle	Patent Dates: Applied: Feb. 17, 1894 Granted: Jul. 24, 1894 Patent Pictures: [ 1 | 2 ] USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen.
Description: Example found with a second patent date, see 632,799

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