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| All Patents in class 403/258 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,629,449 | May 17, 1927 | G.B. Duffield | Valve Operating Device | valves | |
| 2,874,985 | Feb. 24, 1959 | C.J. March | Drill chuck and spindle connection | handheld power drills | |