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| All Patents in class 123/81D | |||||
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| Number | Date | Patentee | Title | Type | |
| 556,195 | Mar. 10, 1896 | F.W. Mellars | Gas or Vapor Engine | ||
| 1,452,995 | Apr. 24, 1923 | M.A. Yeakley | Valve-operating connection | internal combustion engines | |