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US Patent: 1,873,476
Tap holder
Patentee: Harry G. Procunier (exact or similar names) - Chicago, IL USPTO Classifications: 279/67 Tool Categories: metalworking machines : drilling and boring : tapping heads and chucks metalworking tools : tap and die holders Assignees: Procunier Safety Chuck Co. - Chicago, IL Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Feb. 16, 1931 Granted: Aug. 23, 1932 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for William L. Procunier, Procunier Safety Chuck Co.
Description: This chuck-and-collet system is used on Procunier tapping heads.

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