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| Patents for Robert K. Jeffery | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,954,048 | Apr. 10, 1934 | S.C. Moon, R.K. Jeffery | Tool Holder | drilling and boring tool holders | |
| 1,954,049 | Apr. 10, 1934 | R.K. Jeffery | Tool Holder | tool holders | |