US Patent: 1,452,131
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| Auto Jack
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Patentees:
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| Frederick E. Walden, deceased (Estate of) (exact or similar names) - Worcester, Worcester County, MA |
| Grace E. Walden, Executrix (exact or similar names) - Worcester, Worcester County, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Aug. 03, 1920 |
| Granted: |
Apr. 17, 1923 |
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Joel Havens
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