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| All Patents in class 137/625.31 | |||||
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| Number | Date | Patentee | Title | Type | |
| 443,107 | Dec. 23, 1890 | F.C. Olin | Balanced Govenor Valve | ||
| 519,639 | May 08, 1894 | E.S. Matthews | Hydraulic valve | ||
| 533,388 | Jan. 29, 1895 | H. Bolthoff | Register-valve | steam valves | |
| 2,912,011 | Nov. 10, 1959 | F.G. Burg | Valve structure | drill presses | |
| 3,067,768 | Dec. 11, 1962 | J.L. Burg | Temperature compensated hydraulic control device | drill presses | |