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| All Patents in class 123/48A | |||||
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| Picture | Number | Date | Patentee | Title | |
| 253,709 | Feb. 14, 1882 | R. Hutchinson | Gas Engine | ||
| 446,851 | Feb. 24, 1891 | B.H. Coffey | Gas Engine | ||
| 657,226 | Sep. 04, 1900 | M.F. Marmonier | Multiple-Piston Explosion-Motor | ||
| 2,080,720 | May 18, 1937 | C.B. Jahnke | Head Structure for Internal Combustion Engines | ||