Number | Date | Country | Kind |
---|---|---|---|
90120804.1 | Oct 1990 | EPX |
Number | Name | Date | Kind |
---|---|---|---|
4100532 | Farnbach | Jul 1978 | |
4675646 | Lauer | Jun 1987 | |
4855946 | Ruben et al. | Aug 1989 |
Number | Date | Country |
---|---|---|
2110856 | Jun 1983 | GBX |
Entry |
---|
IBM Technical Disclosure Bulletin, vol. 12, No. 2, Jul. 1969, New York, US, p. 247. |