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| All Patents in class 55/DIG.28 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 455,388 | Jul. 07, 1891 | J. Charter | Gas Engine | |
| 661,854 | Nov. 13, 1900 | X. De le Croix | Gas-Engine Attachment | ||
| 735,376 | Aug. 04, 1903 | F.G. Hobart | Crude Oil Vaporizer | ||
 | 806,125 | Dec. 05, 1905 | F.O. Farwell | Rotary Explosive Engine | |
| 1,286,951 | Dec. 10, 1918 | D.P. Davies | Air Strainer | ||
| 1,302,716 | May 06, 1919 | C.E. Sargent | Dust Separator | ||
| 1,847,452 | Mar. 01, 1932 | H.P. Vaughan | Air Cleaner | ||