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US Patent: 2,643,554
Boring Bar Pilot Support
Patentee: Ernest Sperisen (exact or similar names) - Madison, Dane County, WI USPTO Classifications: 408/241R, 82/152 Tool Categories: metalworking machines : metalworking machine tool holders Assignees: Gisholt Machine Co. - Madison, Dane County, WI Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jan. 14, 1948 Granted: Jun. 30, 1953 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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