Bell System Practices No. 4A Toll Switching System Service Manual
This page identifies the Bell System Practices documentation available for the No. 4A Toll Switching System. The exact records listed below are included in the complete digital Bell System Practices collection.
Documentation availableDigital delivery by email
Open Bell System Practices Bundle — Part 1
The complete collection requires Part 2 as well. Individual documents are not sold separately.
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Available documentation
- A128,819 TOLL SWITCHING SYSTEM NO. 4A SEQUENCE CHARTS, OPERATION SKETCHES AND REFERENCE MATERIAL
- A128.819 CHECKING LIST SEQUENCE CHARTS, OPERATION SKETCHES, AND ASSOCIATED REFERENCE MATERIAL NO. 4A OR 4M TOLL SWITCHING SYSTEM
How these documents can help
Depending on the listed document, the material can support model identification, installation, connection checks, maintenance, servicing and historical technical research. The page does not add specifications that are not stated in the source documentation.
Bundle and delivery information
Only the complete two-part digital bundle can be purchased. After purchase, the download link is sent by email. Nothing physical is shipped.
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