After finding this one I found several others, related to this one:
U.S. Patent Documents
| 3981290 | September 1976 | Islas |
| 4287867 | September 1981 | Islas |
| 4781168 | November 1988 | Lester |
| 4858588 | August 1989 | Bozek |
| 5205267 | April 1993 | Burdick |
| 5388564 | February 1995 | Islas |
| 5687703 | November 1997 | Vyprachticky |
It was interesting to see the advancements and how the timing wheel evolved over time.
Original Patent link: 5,967,132
Cheers
PC
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