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US Patent: 115,451
Improvement in machines for tapping nuts
Patentee: John N. Durrell (exact or similar names) - Dunkirk, NY USPTO Classifications: 29/DIG.09, 29/DIG.093, 29/DIG.101, 29/DIG.102, 408/43, 470/87 Tool Categories: specialty machines : nut or bolt making machines Assignees: None Manufacturer: Putnam Machine Co. - Fitchburg, MA Witnesses: S. M. Newton William Bookstave	Patent Dates: Granted: May 30, 1871 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Putnam Machine Co.
Description: In patent 142,511, S. W. Putnam, Jr., made improvements to this patent, from which we infer that Putnam Machine Co. licensed this patent.

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