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| Patents for Robt. H. Ruddell | |||||
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| Number | Date | Patentee | Title | Type | |
| 523,021 | Jul. 17, 1894 | J.A. Traut | Level Vial Adjustment | levels | |
| 523,022 | Jul. 17, 1894 | J.A. Traut | Level | levels | |
| 523,023 | Jul. 17, 1894 | J.A. Traut | Level | levels | |