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| All Patents in class 91/398 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 533,290 | Jan. 29, 1895 | J.D. Gray | Direct-acting steam-engine | |
| 675,112 | May 28, 1901 | R.A. Rutherford | Pneumatic Hoisting Apparatus | ||
 | 693,939 | Feb. 25, 1902 | M.A. Yeakley | Pneumatic hammer | |
 | 1,244,664 | Oct. 30, 1917 | H.E. Warren | Fluid-operated lathe | |
| 2,164,876 | Jul. 04, 1939 | H. Horlacher | Hydraulic Vane Motor | ||
| 2,321,264 | Jun. 08, 1943 | H.H. Turner | Fluid-Pressure Operated Mechanism | ||
| 2,703,040 | Mar. 01, 1955 | H. Horlacher | Machine Tool Control Mechanism | ||