| Number | Date | Country | Kind |
|---|---|---|---|
| 904111 | Aug 1990 | FIX |
| Number | Name | Date | Kind |
|---|---|---|---|
| 4024347 | Carter | May 1977 | |
| 4533791 | Read et al. | Aug 1985 | |
| 4748574 | Tuchto | May 1988 | |
| 5008927 | Weiss et al. | Apr 1991 |
| Number | Date | Country |
|---|---|---|
| 1-314462 | Dec 1989 | JPX |
| Entry |
|---|
| Sederholm et al, "Intelligent Telephone" IBM Tech. Disclosure Bulletin vol. 23 No. 9 Feb. 1981 pp. 4006-4008. |
| Corcoran, "Banking Futures" Scientific American Feb. 1990, pp. 65-66. |