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US Patent: 480,175
Screw Threading Die
Patentee: Richard J. Dearborn (exact or similar names) - Boston, Suffolk County, MA USPTO Classifications: 408/221 Tool Categories: metalworking tools : taps and dies Assignees: Richard J. Dearborn - Boston, Suffolk County, MA Trimont Mfg. Co. - Portland, Cumberland County, ME Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Mar. 31, 1891 Granted: Aug. 02, 1892 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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