Number | Name | Date | Kind |
---|---|---|---|
3218518 | Ashbridge et al. | Nov 1965 | |
3824472 | Engel et al. | Jul 1974 | |
3868158 | Laboue | Feb 1975 | |
4497411 | DeBortoli | Feb 1985 | |
4600107 | Price et al. | Jul 1986 |
Entry |
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IBM Technical Disclosure Bulletin vol. 21 No. 4 Sep. 1978. |