US Patent: 432,635
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| Machine for Making Twist Drills
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Patentee:
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| Samuel Moore (exact or similar names) - Providence, RI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
May 21, 1886 |
| Granted: |
Jul. 22, 1890 |
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Joel Havens
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Description: |
| Henry Marsh jr. - patent attorney
The purpose of my invention is to provide means for grooving and rolling drill-blanks uniformly and without injury to the metal and to perfect the side faces and grooved faces of the blank at the same operation of the machine |
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