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| All Patents in class 92/12 | |||||
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| Number | Date | Patentee | Title | Type | |
| 533,290 | Jan. 29, 1895 | J.D. Gray | Direct-acting steam-engine | steam engines | |
| 582,092 | May 04, 1897 | W.H. Ridgway | Air-hoist | hoists, winches, come-alongs | |
| 649,357 | May 08, 1900 | W.H. Ridgway | Hoisting apparatus | hoists, winches, come-alongs | |
| 2,953,122 | Sep. 20, 1960 | A.I. Zagar | Hydraulic check for air drilling units | multiple spindle drill presses | |