Number | Date | Country | Kind |
---|---|---|---|
2853546 | Dec 1978 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
3602900 | Viroflay et al. | Aug 1971 | |
3803568 | Higashide | Apr 1974 | |
3866184 | Buhrke et al. | Feb 1975 | |
3932847 | Smith | Jan 1976 | |
4144448 | Pisciotta | Mar 1979 |
Entry |
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Brown et al, "Checking Digital System Clock Pulses", IBM Tech. Disclosure Bulletin, vol. 11, No. 3, Aug. 1968, pp. 257-258. |