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| Number | Title | Issue Date |
| 4845739 | Telephonic-interface statistical analysis system A system D interfaces with a multiplicity of individual terminals Tl-Tn of a telephone network facility C, at the terminals callers are prompted by voice-generated instructions to provide digital data that is identified for positive association with a cal... | 07/04/1989 |
| 4792968 | Statistical analysis system for use with public communication facility For use with a public communication facility C incorporating terminals T1-TN, e.g. a telephone system, a statistical analysis system D interfaces with individual stations where a caller is prompted by voice instructions to provide digital data that is ide... | 12/20/1988 |
