US Patent: 2,111,045
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| Lapping machine
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Patentee:
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| Robert S. Drummond (exact or similar names) - Detroit, MI |
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Patent Dates:
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| Applied: |
Aug. 07, 1935 |
| Granted: |
Mar. 15, 1938 |
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Jeff Joslin
Vintage Machinery entry for National Broach & Machine Co.
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Description: |
| This patent number was seen in a brochure from National Broach & Machine Co., Inc., of Detroit, and constitutes an improvement to the inventor's patent 1,989,651. See that patent for more information; the present patent adds a crowning effect to slight round the ends of the teeth. |
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