US Patent: 627,299
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| Metal-working machine
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Patentee:
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| Frank G. Echols (exact or similar names) - Hartford, CT |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jun. 13, 1898 |
| Granted: |
Jun. 20, 1899 |
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Jeff Joslin
Vintage Machinery entry for Pratt & Whitney Co.
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Description: |
| The machine in this patent was designed to manufacture the tap of patent 588,056 and constitutes a different approach from his earlier tap-making machine of patent 602,062. |
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