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| All Patents in class 324/391 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,655,615 | Jan. 10, 1928 | P. Kreisel | Recording and Timing Device for Combustion Engines | internal combustion engine indicators | |
| 2,644,131 | Jun. 30, 1953 | W.R. Elwell, G.M. Walraven | Timing Indicator for Internal Combustion Engines | ||
| 4,489,498 | Dec. 25, 1984 | S.L. Christophersen | Bracket Qualifier Device | ||
| 4,578,755 | Mar. 25, 1986 | J.R. Piehl, C.F. Govekar, R.O. Quinn | Microprocessor Controlled Timing/Tachometer Apparatus | ||