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| All Patents in class 324/156 | |||||
| Number | Date | Patentee | Title | Type | |
| 2,644,131 | Jun. 30, 1953 | W.R. Elwell, G.M. Walraven | Timing Indicator for Internal Combustion Engines | vehicle mechanic | |
| 4,942,356 | Jul. 17, 1990 | L.D. Pacetti, D. Mieczkowski, S.E. Michalski, D.R. Ellingen | Modular electronic device | ||