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| All Patents in class 74/483R | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,486,254 | Oct. 25, 1949 | T.S. Briskin, J.C. Zivny | Control mechanism for electrically driven tools | handheld power drills | |
| 2,608,109 | Aug. 26, 1952 | W.G. Hoelscher | Hand or Power Transmitting Apparatus | metal lathe mechanisms | |
| 3,234,827 | Feb. 15, 1966 | J.F. Probst | Safety Interlock | ||
| 3,389,616 | Jun. 25, 1968 | S.E. Farekas | Lever Interlock | ||