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| All Patents in class 188/181R | |||||
| Picture | Number | Date | Patentee | Title | |
| 1,490,708 | Apr. 15, 1924 | M.L. Norris | Dynamo-electric machine | ||
| 2,963,944 | Dec. 13, 1960 | S.C. Straus | Convertible Milling Machine | ||