US Patent: 7,257
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Divider or Compass
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Patentee:
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Dexter H. Chamberlain (exact or similar names) - Boston, MA |
Manufacturer: |
Not known to have been produced |
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Patent Dates:
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Granted: |
Apr. 09, 1850 |
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Ralph Brendler
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Description: |
This divider provides a micrometer adjustment by cutting teeth in the
outside of the arm, and providing a worm gear attached to a thembscrew to
engage these teeth.
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