| All Patents in class 346/107.1 |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 575,202 | Jan. 12, 1897 | C.H. Bedell | Steam Engine Indicator | steam engine indicators |
| 949,129 | Feb. 15, 1910 | F. Purdy | Engine Indicating Apparatus | internal combustion engine indicators |
| 1,426,735 | Aug. 22, 1922 | W.F. Hendry, C.E. Reddig | Method and Apparatus for Recording Pressure | pressure indicators |
| 1,447,913 | Mar. 06, 1923 | W.C. Duryea, A. Trowbridge | Recording Indicator | pressure indicators |
| 1,490,223 | Apr. 15, 1924 | T. Midgley, Jr. | Indicator | pressure indicators |
| 2,251,976 | Aug. 12, 1941 | G.W. Brown | Indicator for Internal Combustion Engines | internal combustion engine indicators |
