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US Patent: 115,451
Improvement in machines for tapping nuts
Patentee:
John N. Durrell - Dunkirk, NY

USPTO Classifications:
29/DIG.101, 29/DIG.102, 29/DIG.90, 29/DIG.93, 408/43, 470/87

Tool Categories:
specialty machines : nut or bolt making machines

Assignees:
None

Manufacturer:
Putnam Machine Co. - Fitchburg, MA

Witnesses:
William Bookstave
S. M. Newton

Patent Dates:
Granted: May 30, 1871

Patent Pictures:
USPTO pdf tiff
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"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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