US Patent: 201,276
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Improvement in Spirit Level and Plumb
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Patent Dates:
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Applied: |
May 07, 1877 |
Granted: |
Mar. 12, 1878 |
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Description: |
Adjustable level and plumb. Bearing point is rigid while the adjusting screws act directly on the vial casing which is claimed to provide a more certain and delicate adjustment than adjustments provided by springs or spring arms. Known example marked with patent date and R & E MNFG Co. |
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