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Communications
Class Information
Number:
379/293
Name:
Telephonic communications
>
Centralized switching system
>
Switching controlled in response to called station addressing signal
> Having line finder
Description:
Subject matter for locating and connecting a calling line to switching apparatus.
Sub-classes under this class:
Class Number
Class Name
Patents
379/294
Including electronic element (e.g., tube or semiconductor)
1
379/295
Plural
2
Patents under this class:
Patent Number
Title Of Patent
Date Issued
4412101
Call data monitoring for electromechanical telephone switching systems
Oct. 25, 1983
3947643
Method of providing dialtone first on step by step telephone systems
Mar. 30, 1976
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