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公开(公告)号：US3609242A
公开(公告)日：1971-09-28
申请号：US3609242D
申请日：1969-07-28
Applicant: INT STANDARD ELECTRIC CORP
Inventor： PRINCE FRANCOIS LE , BOURY ANDRE
CPC classification number: H04M3/523
Abstract: Awaiting call indicator system is associated with PABX operators'' desks. It enables measuring the duration of public network incoming lines congestions and makes it possible to estimate at any moment the number of awaiting calls. It displays the measurements made with the help of a luminous indicator, this latter to be so-called ''''call-awaiting thermometer.
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