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| All Patents in class 60/39.44 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 364,363 | Jun. 07, 1887 | A.H. Messer | Steam Engine | ||
| 460,070 | Sep. 22, 1891 | J.T. Hobbs, D.D. Hobbs | Rotary Gas Engine | ||
| 547,414 | Oct. 08, 1895 | J.J. Boardman | Gas Engine | ||
| 550,742 | Dec. 03, 1895 | W.R. Campbell | Rotary Gas Engine | ||