US Patent: 297,574
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Spirit Level
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Patentee:
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Leonard L. Davis (exact or similar names) - Springfield, MA |
Manufacturer: |
Not known to have been produced |
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Patent Dates:
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Applied: |
Mar. 10, 1884 |
Granted: |
Apr. 29, 1884 |
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Russ Allen.
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Description: |
Four screws are used to hold and when necessary adjust the level spirit vial. |
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