| All Patents in class 137/468 |
Patents 1 -
10
of 12
      |
| Picture | Number | Date | Patentee | Title |
 | 85,792 | Jan. 12, 1869 | G.H. Clemens | Improvement in steam safety-valves |
| | 881,060 | Mar. 03, 1908 | J.J. Cook | Valve |
| | 2,012,550 | Aug. 27, 1935 | R. Powis | Viscosometer |
| | 2,183,650 | Dec. 19, 1939 | G.L. Gundersen, E. Klafstad | Relief Valve |
| | 2,192,117 | Feb. 27, 1940 | D.D. Wile | Control Device |
| | 2,259,280 | Oct. 14, 1941 | D.D. Wile | Control Device |
 | 2,287,433 | Jun. 23, 1942 | E. Klafstad | System for Safeguarding the Operation of Steam Boilers |
| | 2,317,556 | Apr. 27, 1943 | P.S. Russel | Liquid Level Controlling Means |
| | 2,520,386 | Aug. 29, 1950 | E.J. Dillman | Refrigeration Expansion Valve |
| | 2,592,913 | Apr. 15, 1952 | M.E. Landon, Administratrix, W.S. Landon, deceased (Estate of) | Liquid Level Control Means |
