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| Patents for Robert Gillham | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,718,726 | Jun. 25, 1929 | G. Langen, R. Gillham, T. Addison | Oiling System | ||
| 1,760,639 | May 27, 1930 | G. Langen, F. Wetzel, T. Addison, R. Gillham | Control Mechanism for Metal Planers | ||