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| All Patents in class 174/138R | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,669,134 | May 08, 1928 | N.T. Kelso | Molded commutator | electric motor making | |
| D151,876 | Nov. 30, 1948 | H.W. Edwards | Insulator Applying And Removing Hammer | hammers | |