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| All Patents in class 92/141 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,739,007 | Dec. 10, 1929 | E.T. Larkin | Piston for Internal Combustion Engines | pistons | |
| 2,104,347 | Jan. 04, 1938 | E.T. Larkin | Piston | pistons | |