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| Patents for H. R. Sullivan | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,082,282 | Dec. 23, 1913 | R.B. Tewksbury, H.W. Oster | Die-stock | taps and dies | |
| 1,116,838 | Nov. 10, 1914 | W.J. Macak, H.W. Oster | Die-stock | taps and dies | |