Number | Date | Country | Kind |
---|---|---|---|
59-202982 | Sep 1984 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
3737863 | Rowland et al. | Jun 1973 | |
3774158 | Clark | Nov 1973 | |
3872448 | Mitchell, Jr. | Mar 1975 | |
3872448 | Mitchell, Jr. | Mar 1975 | |
4128891 | Lin et al. | Dec 1978 | |
4260854 | Kolodny et al. | Apr 1981 | |
4315309 | Coli | Feb 1982 | |
4347568 | Giguere et al. | Aug 1982 | |
4653112 | Ouimette | Mar 1987 | |
4731725 | Suto et al. | Mar 1988 |
Number | Date | Country |
---|---|---|
3311663 | Apr 1982 | DEX |
2020455 | Dec 1979 | GBX |
Entry |
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C. J. Date; An Introduction to Database Systems, 1981, Addison-Wesley, esp. 5.3.2 pp. 64-67; 54.1,4.2; 83-87; 54.5; 91-93; 572; 117-131. |