US Patent: 1,777,429
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| Level
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Patentee:
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| Richard C. Charlton (exact or similar names) - Philadelphia, PA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Dec. 08, 1926 |
| Granted: |
Oct. 07, 1930 |
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Russ Allen.
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Description: |
| Lightweight open frame level with T-shaped cross section. Inventor indicates aluminum alloy is the recommended construction material. |
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