| All Patents in class 251/357 |
Patents 1 -
7
of 7
      |
| Number | Date | Patentee | Title | Type |
| 39,852 | Sep. 08, 1863 | W. Watts | Steam Pump | steam pumps |
| 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 | internal combustion engine valves |
| 1,014,591 | Jan. 09, 1912 | W.F. Gould | Balanced Valve | steam engine valves |
| 1,014,592 | Jan. 09, 1912 | W.F. Gould | Balanced Valve | steam engine valves |
| 1,226,040 | May 15, 1917 | N.W. Whitbeck | Valve | valves |
| 2,505,992 | May 02, 1950 | H.W. Webb, F.F. Rike | Valve | |
