US Patent: 87,309
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| Bit-stock
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Patentees:
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| John W. Thompson (exact or similar names) - Greenfield, MA |
| Francis M. Thompson (exact or similar names) - Greenfield, MA |
| USPTO Classifications: |
| 81/35 |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Feb. 23, 1869 |
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Kirk Eppler
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