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| All Patents in class 91/393 | |||||
| Picture | Number | Date | Patentee | Title | |
![]() | 533,290 | Jan. 29, 1895 | J.D. Gray | Direct-acting steam-engine | |
![]() | 1,244,664 | Oct. 30, 1917 | H.E. Warren | Fluid-operated lathe | |