US Patent: 111,248
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| Improvement in machines for cutting screw-threads on bolts
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Patentee:
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| Salmon W. Putnam, Jr. (exact or similar names) - Fitchburg, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Jan. 24, 1871 |
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Joel Havens
"Vintage Machinery" entry for Putnam Machine Co.
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Description: |
| Crosby, Halsted & Gould - patent attorneys
This invention relates details in the construction of that class of machines in which the bolt to be screw threaded is held from rotation, but is allowed to advance toward and. retreat from the screw-thread-forming dies which are made to rotate.
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