US Patent: 930,620
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| Combined breast-drill and valve-grinder
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Patentee:
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| John R. Sandberg (exact or similar names) - Denver, CO |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Aug. 21, 1908 |
| Granted: |
Aug. 10, 1909 |
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Patent Pictures:
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Sandberg 930,620 |
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George Langford
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Description: |
| John has designed a rather traditional style breast drill with a set of pawls. When one or the other of the pawls is engaged it gives the drill the reciprocal movement for valve grinding. |
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