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| Patents for Dwight Morse De Silva | |||||
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| Number | Date | Patentee | Title | Type | |
| 296,540 | Apr. 08, 1884 | D.M. De Silva | EUREKA ALLIGATOR PIPE TONG OR WRENCH | pipe wrenches | |
| CA-20,659 | Nov. 29, 1884 | D.M. De Silva | Wrench | alligator wrenches | |