Number | Name | Date | Kind |
---|---|---|---|
3311522 | Ladd et al. | Mar 1967 | |
3639701 | Secrist et al. | Feb 1972 | |
3672045 | Robertson | Jun 1972 | |
3772471 | Imai et al. | Nov 1973 | |
4276331 | Bothwell | Jun 1981 |
Entry |
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IBM Technical Disclosure Bulletin, vol. 21, No. 11, Apr. 1979, p. 4373. |