US Patent: 1,403,606
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| Level
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Patentee:
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| Charles L. Klapproth (exact or similar names) - Midland, TX |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jun. 11, 1921 |
| Granted: |
Jan. 17, 1922 |
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Ralph Brendler
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Description: |
| This level is hinged in the center to allow it to be used as a bevel gauge. It also includes sights at each end to allow it to be used as a sighting-level, and a graduated plate to allow it to be used as a protractor. |
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