US Patent: 2,903,922
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| Self-Centering Drill
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Patentees:
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| Hans Ernst (exact or similar names) - Cincinnati, Hamilton County, OH |
| William A. Haggerty (exact or similar names) - Cincinnati, Hamilton County, OH |
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Patent Dates:
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| Applied: |
Feb. 20, 1956 |
| Granted: |
Sep. 15, 1959 |
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Patent Pictures:
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Joel Havens
"Vintage Machinery" entry for Cincinnati Milling Machine Co.
Cincinnati Spiropoint Drill Sharpener
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Description: |
| Hans Ernst & William A. Haggerty, Patent Attorneys |
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