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| All Patents in class 123/73A | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,625,043 | Apr. 19, 1927 | H.E. McCray | Internal Combustion Engine | ignition systems | |
| 1,825,318 | Sep. 29, 1931 | L.B. Kapp | Pump | internal combustion engine lubrication | |
| 2,433,007 | Dec. 23, 1947 | C.S. Weyandt | Internal-combustion percussion tool | gas and gasoline engines | |
| 2,832,855 | Apr. 29, 1958 | W.E. Armstrong | Ignition Timing Advance Mechanism | ignition systems | |