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| All Patents in class 310/216.026 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,577,976 | Mar. 23, 1926 | J.S. Knowlson, R.S. McKeage | Power-driven tool-operating device | handheld power drills | |
| 2,136,301 | Nov. 08, 1938 | J.S. Hoddy, G.W. Hoddy | Dynamo-electric machine | ||