| All Patents in class 137/505 |
Patents 1 -
10
of 10
      |
| Number | Date | Patentee | Title | Type |
| 27,704 | Apr. 03, 1860 | F. Douglas | Improved steam-trap | steam engines |
| 260,097 | Jun. 27, 1882 | B. Holly | Apparatus for Supplying Steam | steam heating |
| 383,225 | May 22, 1888 | A.G. Hohenstein | Pressure-regulator | steam valves |
| 383,226 | May 22, 1888 | A.G. Hohenstein | Automatic pressure-regulator and safety-valve | steam valves |
| 998,201 | Jul. 18, 1911 | W. Raymond | Regulator for fluid-compressors | air compressors |
| 1,916,433 | Jul. 04, 1933 | W.C. Muller | Speed Control Valve | hydraulic apparatus |
| 2,020,773 | Nov. 12, 1935 | H. Ernst | Deflection Variator | metalworking machine mechanisms |
| 2,152,837 | Apr. 04, 1939 | E. Cannon | Prefill valve for hydraulic presses | hydraulic metalworking presses |
| 2,166,940 | Jul. 25, 1939 | C.M. Conradson | Hydraulic Power System | machine tool controls |
| 2,577,455 | Dec. 04, 1951 | E.J. Dillman | Pressure Regulator | refrigeration apparatus |
