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| All Patents in class 279/150 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,119,986 | Jun. 07, 1938 | A.J. Dremel | Electric motor | handheld power tools | |
| 2,211,216 | Aug. 13, 1940 | J. Oster | Small power driven tool | handheld power tools | |
| 2,893,274 | Jul. 07, 1959 | F.H. Mueller | Tool Holder | drilling and boring tool holders | |
| 3,021,723 | Feb. 20, 1962 | R. Happe | Spindle locking means for portable tools | handheld power drills | |