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| All Patents in class 251/357 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 39,852 | Sep. 08, 1863 | W. Watts | Steam Pump | |
 | 85,749 | Jan. 12, 1869 | C.H. Mellor | Improved method of securing rubber rings or disks to the door of vats, &c. | |
 | 556,037 | Mar. 10, 1896 | C.W. Weiss | Valve | |
 | 1,014,591 | Jan. 09, 1912 | W.F. Gould | Balanced Valve | |
 | 1,014,592 | Jan. 09, 1912 | W.F. Gould | Balanced Valve | |
| 1,226,040 | May 15, 1917 | N.W. Whitbeck | Valve | ||
| 2,505,992 | May 02, 1950 | H.W. Webb, F.F. Rike | Valve | ||