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| All Patents in class 137/625.23 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 217,176 | Jul. 01, 1879 | D. Lang, A. Linn, A.J. Ulscht | Improvement in apparatus for regulating pressure in fermenting-casks | |
 | 1,446,547 | Feb. 27, 1923 | J.M. Crowe | Valve for pneumatic tools | |
 | 2,671,294 | Mar. 09, 1954 | E.S. Cornell | Hydraulically Driven Machine Tool | |
| 4,658,859 | Apr. 21, 1987 | L.W. Durham, B.S. Backe | Valve Spool with Cross Drill Ports | ||