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| Patents for Robert L. Carter | |||||
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| Number | Date | Patentee | Title | Type | |
| 342,350 | May 25, 1886 | F.H. Cook, C.E. Gould | Pencil-sharpener | pencil sharpeners | |
| 402,673 | May 07, 1889 | C.E. Hudson | Appliance For Uniting and Repairing Rubber Hose | pliers | |