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| Patents for W. S. Robertson | |||||
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| Number | Date | Patentee | Title | Type | |
| 372,750 | Nov. 08, 1887 | C.W. Hale | Wrench | pipe and nut combination wrenches | |
| 378,890 | Mar. 06, 1888 | F. Larson | Bench Dog | bench stops | |