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| All Patents in class 123/DIG.4 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 391,338 | Oct. 16, 1888 | A. Rollason | Gas or Caloric Engine | |
| 1,279,774 | Sep. 24, 1918 | C.G. Sprado | Gas Engine | ||
| 1,503,383 | Jul. 29, 1924 | C.E. Sargent | Internal Combustion Engine | ||