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| All Patents in class 123/310 | |||||
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| Number | Date | Patentee | Title | Type | |
| 674,029 | May 14, 1901 | W.G. Stolz | Igniter or Circuit Breaker | ignition systems | |
| 1,099,364 | Jun. 09, 1914 | F.W. Heisler, C.L. Heisler | Governor for Controlling the Speed of Engines and Machinery | steam engine governors | |
| 2,282,581 | May 12, 1942 | K.A. Harmon | Ignition means for radial engines | ignition systems | |