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US Patent: 1,431,409
Slide Rule
Patentee: William L. Miller (exact or similar names) - Madison, Dane County, WI USPTO Classifications: 235/70R Tool Categories: rules : slide rules Assignees: Gisholt Machine Co. - Madison, Dane County, WI Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: May 05, 1920 Granted: Oct. 10, 1922 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Gisholt Machine Co.

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