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| All Patents in class 123/152 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,648,737 | Nov. 08, 1927 | H.E. McCray | Internal Combustion Engine | ||
| 1,679,220 | Jul. 31, 1928 | C.B. Jahnke | Ignition System | ignition systems | |