US Patent: 61,799
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Improvement in Calipers
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Patentee:
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H. A. Boardman (exact or similar names) - New Haven, CT |
Manufacturer: |
Not known to have been produced |
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Patent Dates:
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Granted: |
Feb. 05, 1867 |
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Ralph Brendler
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Description: |
This design covers a fairly typical caliper with a screw adjust for the
arms and a spring to keep the arms in tension.
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