| All Patents in class 137/540 |
Patents 1 -
8
of 8
      |
| Picture | Number | Date | Patentee | Title |
| | 122,756 | Jan. 16, 1872 | W. Camerer | Improvement in safety-valves |
| | 186,783 | Jan. 30, 1877 | H.G. Ashton | Improvement in Safety-Valve Attachments to Utilize the Escape-Steam |
| | 306,208 | Oct. 07, 1884 | R. Gould, H.G. Ashton | Safety Valves |
| | 465,480 | Dec. 22, 1891 | F.W. Lanchester | Gas Motor Engine |
| | 1,346,921 | Jul. 20, 1920 | E. Terry | Automatic Valve |
| | 1,375,497 | Apr. 19, 1921 | E.H. Eickman | Valve |
| | 2,123,826 | Jul. 12, 1938 | E.J. Dillman | Nozzle |
 | 2,815,040 | Dec. 03, 1957 | R.V. Smith | Pressure relief valve |
