US Patent: 1,409,537
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| Universal Level
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Patentee:
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| Henry M. Franzen (exact or similar names) - Los Angeles, CA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Nov. 01, 1920 |
| Granted: |
Mar. 14, 1922 |
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Ralph Brendler
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Description: |
| This level consists of two curcular level tubes perpendicular to each other, allowing the level to indicate in two directions at once. The inventor claims it to be particularly useful in airplanes. |
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