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| Patents for Robert L. Gilbert | |||||
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| Picture | Number | Date | Patentee | Title | |
| 455,957 | Jul. 14, 1891 | C.F. Young | Cutter Adjustment for "B" Planes | ||
| 456,104 | Jul. 14, 1891 | C.F. Young | Cammed Screw for Cutter and Capiron | ||