| All Patents in class 73/114.18 |
Patents 1 -
7
of 7
      |
| Number | Date | Patentee | Title | Type |
| 1,426,735 | Aug. 22, 1922 | C.E. Reddig, W.F. Hendry | 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 |
| 1,492,754 | May 06, 1924 | J.H. Sheats | Engine Indicator | internal combustion engine 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 |
| 2,365,227 | Dec. 19, 1944 | C. Unterberg | Engine Operation Analyzer | internal combustion engine indicators |
