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SWBT Service And Equipment Manual [08] - Part VI: Dial PBX Systems Section 8 Emergency Reporting
ca 1948 with later additions.  Includes 520-type switchboards and 570-type telephones.  Other parts of this manual are in separate documents.  The number in brackets [n] is the sort order for this document based on the documents currently in the Library.  It may change as new sections of the manual are added.
 
Keywords:  911-like; dispatching; 520A; 520B; selective routing; annunciator; call recorder; 570

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