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US Patent: 81,480
Improvement in cast nuts
Patentee: George P. Darrow (exact or similar names) - Cincinnati, OH USPTO Classifications: 411/437 Tool Categories: Assignees: James L. Haven & Co. - Cincinnati, OH Manufacturer: Not known to have been produced Witnesses: James H. Layman Octavius Knight	Patent Dates: Granted: Aug. 25, 1868 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for James L. Haven & Co.

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