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US Patent: 428,803
Tap
Patentee: Peter T. Coffield (exact or similar names) - New Carlisle, Clark County, OH USPTO Classifications: 408/155 Tool Categories: metalworking tools : taps and dies Assignees: Superior Machine Co. - Springfield, Clark County, OH Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Nov. 11, 1889 Granted: May 27, 1890 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Superior Machine Co.; F. H. Bultman & Co.

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