US Patent: 588,056
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| Screw Cutting Tool
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Patentee:
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| Frank G. Echols (exact or similar names) - Hartford, CT |
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Patent Dates:
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| Applied: |
May 08, 1897 |
| Granted: |
Aug. 10, 1897 |
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Patent Pictures:
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Russ Allen.
"Vintage Machinery" entry for Pratt, Whitney & Co.
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Description: |
| Five flute cutter instead of the standard four flute cutter and addition gaps between the cutting teeth to facilitate lubricant and chip movement. Applicable to both taps and dies. Known example marked: P&W CO.
Frank G. Echols was a manager at the Pratt & Whitney Co. |
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