US Patent: 3,141,228
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| Toolholder
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Patentees:
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| William Bader (exact or similar names) - Ferndale, Oakland County , MI |
| Robert W. Berry, Jr. (exact or similar names) - Ferndale, Oakland County , MI |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Nov. 29, 1960 |
| Granted: |
Jul. 21, 1964 |
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Joel Havens
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