| All Patents in class 346/49 |
Patents 1 -
13
of 13
      |
| Number | Date | Patentee | Title | Type |
| 41,182 | Jan. 05, 1864 | W.B. Le Van, S.L. Wiegand | Steam Engine Indicator | steam engine indicators |
| 615,161 | Nov. 29, 1898 | T. Gray | Continuous Engine Indicator | steam engine indicators |
| 713,945 | Nov. 18, 1902 | E.C. Oliver, L.P. Beckenridge | Recording Machine | steam engine indicators |
| 898,474 | Sep. 15, 1908 | M.W. Hogle | Continuous Engine Indicator | steam engine indicators |
| 956,680 | May 03, 1910 | G. Cipollina | Steam Engine Power Gage | steam engine indicators |
| 1,030,216 | Jun. 18, 1912 | J.N. Wallace | Indicator for Steam, Gas and Other Engines | steam engine indicators |
| 1,056,950 | Mar. 25, 1913 | J.W. Sheperdson | Engine Indicator | steam engine indicators |
| 1,352,150 | Sep. 07, 1920 | E. Schneider | Recorder for Fluid Pressure Presses | hydraulic presses |
| 1,447,913 | Mar. 06, 1923 | W.C. Duryea, A. Trowbridge | Recording Indicator | pressure indicators |
| 1,511,574 | Oct. 14, 1924 | E.H. Mortsell | Indicating and Recording Instrument | internal combustion engine indicators |
| 1,539,978 | Jun. 02, 1925 | G.B. Vroom | Chronograph | steam engine indicators |
| 1,690,517 | Nov. 06, 1928 | C.J. Brown, C.H. Wilson | Electrical controller and recorder | industrial furnaces |
| 1,761,163 | Jun. 03, 1930 | I.A. Weaver | King-pin testing appliance | vehicle mechanic |
