US Patent: 1,281,140
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| Drill
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Patentees:
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| Richard A. Conkling (exact or similar names) - Tulsa, OK |
| William Richard Guiberson (exact or similar names) - Tulsa, OK |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jan. 26, 1918 |
| Granted: |
Oct. 08, 1918 |
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Joel Havens
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Description: |
| Vernon E. Hodge - patent attorney |
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