| All Patents in class 137/478 |
Patents 1 -
10
of 10
      |
| Picture | Number | Date | Patentee | Title |
| | 291,126 | Jan. 01, 1884 | H.G. Ashton | Safety-Valve |
| | 917,077 | Apr. 06, 1909 | C.H. Kaplinger | Safety Valve |
| | 1,032,482 | Jul. 16, 1912 | W.E. Jerauld | Safety Valve |
| | 1,231,330 | Jun. 26, 1917 | G.H. Clark | Safety Valve |
| | 1,233,752 | Jul. 17, 1917 | G.H. Clark | Safety Valve |
| | 1,356,853 | Oct. 26, 1920 | G.H. Clark | Safety Valve |
| | 1,380,094 | May 31, 1921 | G.H. Clark | Safety Valve |
| | 1,685,866 | Oct. 02, 1928 | F.E. Raymond | Safety and Relief Valve |
| | 1,743,430 | Jan. 14, 1930 | G.S. Coffin | Safety Valve |
 | 2,597,057 | May 20, 1952 | T.W. Bergquist | Safety valve |
