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| All Patents in class 251/29 | |||||
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| Number | Date | Patentee | Title | Type | |
| 639,293 | Dec. 19, 1899 | H. Ritter | Sight Feed Oil Cup | oil cups | |
| 691,570 | Jan. 21, 1902 | H. Ritter | Lubricator | oil cups | |
| 787,422 | Apr. 18, 1905 | F.L. Wolfe | Whistle Valve | steam valves | |
| 2,620,823 | Dec. 09, 1952 | R.D. Wortendyke, R.R. Adams | Tracer Valve Mechanism with Dashpot | hydraulic apparatus | |