| All Patents in class 137/505 |
Patents 1 -
10
of 11
      |
| Picture | Number | Date | Patentee | Title |
 | 27,704 | Apr. 03, 1860 | F. Douglas | Improved steam-trap |
 | 188,740 | Mar. 27, 1877 | H. Murphy, A. Kipp, Jr. | Improvement in gas-regulators |
 | 260,097 | Jun. 27, 1882 | B. Holly | Apparatus for Supplying Steam |
 | 383,225 | May 22, 1888 | A.G. Hohenstein | Pressure-regulator |
 | 383,226 | May 22, 1888 | A.G. Hohenstein | Automatic pressure-regulator and safety-valve |
 | 998,201 | Jul. 18, 1911 | W. Raymond | Regulator for fluid-compressors |
| | 1,916,433 | Jul. 04, 1933 | W.C. Muller | Speed Control Valve |
| | 2,020,773 | Nov. 12, 1935 | H. Ernst | Deflection Variator |
| | 2,152,837 | Apr. 04, 1939 | E. Cannon | Prefill valve for hydraulic presses |
| | 2,166,940 | Jul. 25, 1939 | C.M. Conradson | Hydraulic Power System |
