US Patent: 2,456,060
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| Rotor Grinder
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Patentees:
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| Joseph H. Hoern (exact or similar names) - Birmingham, Oakland County, MI |
| Curtis G. Pardee (exact or similar names) - Detroit, Wayne County, MI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Dec. 29, 1945 |
| Granted: |
Dec. 14, 1948 |
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Joel Havens
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