US Patent: 275,431
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| Metal Screw Machine
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Patentee:
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| Christopher M. Spencer (exact or similar names) - Hartford, Hartford County, CT |
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Patent Dates:
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| Applied: |
Aug. 26, 1882 |
| Granted: |
Apr. 10, 1883 |
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Patent Pictures:
[
1 | 2
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Joel Havens
"Vintage Machinery" entry for Pratt, Whitney & Co.
Christopher Miner Spencer, 19th-century Arms Manufacturer
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Description: |
| The Pratt & Whitney Co. made these machines for the Hartford Screw Machine Co. |
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