US Patent: 2,641,875
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| Grinding Wheel Speed Regulator
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Patentees:
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| Roy G. Kirby (exact or similar names) - Cincinnati, Hamilton County, OH |
| John M. Morgan, Jr. (exact or similar names) - Cincinnati, Hamilton County, OH |
| Jacob Decker (exact or similar names) - Cincinnati, Hamilton County, OH |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Sep. 26, 1951 |
| Granted: |
Jun. 16, 1953 |
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Joel Havens "Vintage Machinery" entry for Cincinnati Milling Machine Co.
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