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| Patents for C. L. Waal | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,339,422 | May 11, 1920 | A.C. Rosenbrook | Valve Tool | valve spring tools | |
| 1,376,861 | May 03, 1921 | F.M. Davis | Universal duplex milling-machine | milling machines | |