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| All Patents in class 174/152R | |||||
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| Number | Date | Patentee | Title | Type | |
| 352,796 | Nov. 16, 1886 | C.W. Baldwin | Electrical Igniter for Gas Engines | ignition systems | |
| 3,170,735 | Feb. 23, 1965 | H.H. Coffin | Insulated die set | tool and die maker | |