US Patent: 6,721X
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Balance
Improvement on Dearborn's balance
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| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Aug. 23, 1831 |
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Joel Havens
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Description: |
| This patent is an improvement of patent #234X.
Most of the patents prior to 1836 were lost in the Dec. 1836 fire. Only about 2000 of the almost 10000 documents were recovered.
Little is known about this patent. Only the patent drawing is available. This patent is in the database for reference only. |
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