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US Patent: 1,403,366
Screw Punch
Patentee: William A. Whitney (exact or similar names) - Rockford, Winnebago County, IL USPTO Classifications: 408/102 Tool Categories: metalworking machines : metal punching machines Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Feb. 12, 1920 Granted: Jan. 10, 1922 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Roper-Whitney Co.

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