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| All Patents in class 254/30 | |||||
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| Number | Date | Patentee | Title | Type | |
| 292,630 | Jan. 29, 1884 | S.K. Duff, J.B. Duff | Pipe-lifter for oil-wells | ||
| 2,776,470 | Jan. 08, 1957 | R.G. Knudsen | Cylinder Sleeve Pulling Device and the Like | ||