Artifact Details


Electronic switching systems no. 1 : arranged with 2-wire features

Document Titles

Busy verify program

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Call waiting program

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Centrex call answering from any station

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Centrex lamp control program

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Centrex simulated facilities program

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Centrex trunk preemption program

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Feature values for generic edits

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K-level interrupt program

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Line and trunk seizure of centrex attendant

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LXX tandem tie line program

Document Titles

Recorded announcement machine program

Document Titles

SP operational programs

Catalog Number





Items in this folder were originally bound. This folder contains multiple program listings. All listings are labeled "AT&TCo SPCS."




Bell Telephone Laboratories, Inc.

Identifying Numbers

Publication number PR-1A164-14 Line and trunk seizure
Publication number PR-1A165-12 Centrex call answering from any station
Publication number PR-1A166-14 Centrex lamp control prog.
Publication number PR-1A167-14 Centrex trunk preemption program
Publication number PR-1A168-14 Call waiting program
Publication number PR-1A169-14 Centrex simulated facilities program
Publication number PR-1A170-14 LXX tandem tie line program
Publication number PR-1A171-14 Busy verify program
Publication number PR-1A172-14 Recorded announcement machine program
Publication number PR-1A190-03 K-level interrupt program
Publication number PR-1A198-14 Feature values for generic edits
Publication number PR-1A200-10 SP operational programs


Program Listing

Collection Title

Al Kossow collection


Gift of Al Kossow

Lot Number