| All Patents in class 346/4 |
Patents 16 -
30
of 58
      |
| Number | Date | Patentee | Title | Type |
| 687,827 | Dec. 03, 1901 | A.T. Hill | Record Motor for Engine Indicators | steam engine indicators |
| 713,945 | Nov. 18, 1902 | E.C. Oliver, L.P. Beckenridge | Recording Machine | steam engine indicators |
| 737,298 | Aug. 25, 1903 | O. Tuch | Engine Indicator | steam engine indicators |
| 754,287 | Mar. 08, 1904 | G. Bouton, A. De Dion | Pressure Indicator | steam engine indicators |
| 867,953 | Oct. 15, 1907 | T. Davidson | Engine Indicator | steam engine indicators |
| 868,056 | Oct. 15, 1907 | F.L. Wolfe | Engine Indicator | steam engine indicators |
| 886,021 | Apr. 28, 1908 | J.W. Thompson | Engine Indicator | steam engine indicators |
| 898,474 | Sep. 15, 1908 | M.W. Hogle | Continuous Engine Indicator | steam engine indicators |
| 902,586 | Nov. 03, 1908 | G. Lanza | Engine Indicator | steam engine indicators |
| 912,680 | Feb. 16, 1909 | B. Hopkinson | Steam Engine and Like Indicator | steam engine indicators |
| 932,825 | Aug. 31, 1909 | C.W. Snyder | Indicator | steam engine indicators |
| 949,129 | Feb. 15, 1910 | F. Purdy | Engine Indicating Apparatus | internal combustion engine indicators |
| 951,131 | Mar. 08, 1910 | A.P. Kinney | Continuous Card Indicator | steam engine indicators |
| 956,680 | May 03, 1910 | G. Cipollina | Steam Engine Power Gage | steam engine indicators |
| 991,843 | May 09, 1911 | J.F. Gill | Engine Indicator | steam engine indicators |
