US Patent: 924,699
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| Attachment for Drilling Machines
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Patentees:
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| Claude E. Sprague (exact or similar names) - Chattaroy, Spokane County, WA |
| Randolph M. Elliott (exact or similar names) - Chattaroy, Spokane County, WA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Aug. 13, 1908 |
| Granted: |
Jun. 15, 1909 |
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Joel Havens
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