Number | Name | Date | Kind |
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4726056 | An et al. | Feb 1988 | |
4757267 | Riskin | Jul 1988 |
Entry |
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"Mass Announcement System", Engineering and Operations in the Bell System, Second Edition, Reorganized and Rewritten Telecommunications in the Bell System in 1982-1983, pp. 513-516. |
"Announcing a Telecommunications Breakthrough for Caller-Paid Services: AT&T MultiQuest", BP 3308-01, 12/88, promotional brochure. |