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| Patents for Robert W. Ellingham | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,445,875 | Feb. 20, 1923 | R.W. Ellingham, C.E. Van Norman | Grinding machine | vehicle mechanic | |
| 1,515,568 | Nov. 11, 1924 | R.W. Ellingham, G.W. Fleming | Grinding machine | cylindrical grinders | |