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| All Patents in class 310/255 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 847,849 | Mar. 19, 1907 | G.A. True | Trolley for traveling cranes | |
 | 1,115,406 | Oct. 27, 1914 | J.L. Davis | Dynamo-electric machine | |
 | 1,300,922 | Apr. 15, 1919 | P. Brown | Igniter | |
| 1,540,038 | Jun. 02, 1925 | M.H. Spielman | Electric motor | ||
 | 2,763,802 | Sep. 18, 1956 | F.D. Dolan | Portable motor tool and method of assembling same | |