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| Patents for Robert L. Hibbard | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,477,562 | Dec. 18, 1923 | R.L. Hibbard, F.W. Wappat | Gear cutting | gear making machines | |
| 1,861,498 | Jun. 07, 1932 | R.L. Hibbard | Boring Head | boring heads | |