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