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| All Patents in class 310/28 | |||||
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| Number | Date | Patentee | Title | Type | |
| 520,810 | Jun. 05, 1894 | E. Thomson | Electric Reciprocating Motor | electric motors | |
| 1,797,253 | Mar. 24, 1931 | C.S. Weyandt | Reciprocating motor | handheld power tools | |
| 2,786,950 | Mar. 26, 1957 | T.F. Carmichael, E.G. Sturgeon | Vibratory power tool | handheld power sanders | |
| 2,878,404 | Mar. 17, 1959 | T.F. Carmichael | Electromagnetic device | handheld power tools | |