| All Patents in class 137/596 |
Patents 1 -
7
of 7
      |
| Number | Date | Patentee | Title | Type |
| RE921 | Mar. 06, 1860 | A. Crosby | Improved valve for steam-engines | steam engine valves |
| 257,871 | May 16, 1882 | J. Humphreys, Jr. | Pump | rotary pumps |
| 486,099 | Nov. 15, 1892 | H.F. Frisbie | Valve for Steam Engines | steam engine valves |
| 666,156 | Jan. 15, 1901 | E.B. Ridgway | Steam hydraulic elevator | elevators and lifts |
| 808,014 | Dec. 19, 1905 | E.T. Cope | Steam Engine Valve | steam engine valves |
| 1,537,437 | May 12, 1925 | G. Graffinberger | Trimmer-saw mechanism | circular sawmills |
| 3,696,834 | Oct. 10, 1972 | W. Vonhoff, Jr. | Fluid control device | |
