US Patent: 128,513
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Improvement in Spirit Levels
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Patentee:
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Justus A. Traut (exact or similar names) - New Britain, CT |
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Patent Dates:
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Granted: |
Jul. 02, 1872 |
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Russ Allen.
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Description: |
One end of the face plate of a sprirt vial case is secured on a raised edge to the opposite end can be adjusted up and down by use of a spring and screw. |
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