Number | Name | Date | Kind |
---|---|---|---|
3812533 | Kimura et al. | May 1974 | |
4149198 | Behr et al. | Apr 1979 | |
4346413 | Hack | Aug 1982 | |
4454549 | Pennington | Jun 1984 | |
4488187 | Alaimo | Dec 1984 |
Entry |
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"Servo System for Magnetic Recording Based on Time Comparison", IBM Technical Disclosure Bulletin, vol. 23, No. 2, Jul. 1980, pp. 787-789, Gruss et al. |