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| All Patents in class 123/54.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,134,967 | Apr. 06, 1915 | J.D. Lowe, F.W. Spacke, D.T. Brownlee | Compression Space Annex for Internal Combustion Engine | valve gear | |
| 2,260,975 | Oct. 28, 1941 | R.M. Hvid | Internal Combustion Engine | oil engines | |