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| All Patents in class 228/234.1 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 2,693,725 | Nov. 09, 1954 | H.D. Cummins | Method of Making Cutting Tools | ||
| 3,421,212 | Jan. 14, 1969 | E.W. Chabot | Method of producing commutator lead connection | ||