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| All Patents in class 294/86.31 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,281,140 | Oct. 08, 1918 | W.R. Guiberson, R.A. Conkling | Drill | ||
| 2,263,910 | Nov. 25, 1941 | G.H. Williams | Standing Valve Puller | oil well pumps | |