US Patent: 764,809
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Combined Level and Grade Finder
The American Combined Level and Grade Finder
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Patentee:
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| Edward Helb (exact or similar names) - Railroad, PA |
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Patent Dates:
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| Applied: |
Apr. 12, 1904 |
| Granted: |
Jul. 12, 1904 |
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Patent Pictures:
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Russ Allen
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Description: |
| Incorrectly called a railroad level due to the city (Railroad) of the inventor. Combination level and inclinometer with a mirror viewing aperture designed for road building and construction. Mr. Helb also received a Canadian patent, CA-90,643, on Dec 20, 1904. |
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