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| All Patents in class 250/551 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,469,952 | Sep. 04, 1984 | D.D. Grover, T.P. Becker, G.E. Olson | Adapter for Diesel-Engine-Timing Meter | ||
| 4,767,175 | Aug. 30, 1988 | G. Wohlhaupter, H. Gähr, C. Böhner | Rotary device for transmitting light signals including annular photoelectric transducers | ||