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| All Patents in class 123/41.38 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,059,713 | Nov. 03, 1936 | H. Schneider | Engine Piston | pistons | |
| 2,541,919 | Feb. 13, 1951 | L.E. Endsley | Piston Cooling | cooling apparatus | |
| 2,571,022 | Oct. 09, 1951 | L.E. Endsley | Piston Cooling | pistons | |
| 2,687,930 | Aug. 31, 1954 | G.L. Smith | Piston for Internal Combustion Engines | pistons | |