pdf 518-215-405 ~ 513, 514, 515-Type KSUs Connections ~Maintenance Popular
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518-215-405 ~ 513, 514, 515-Type KSUs Connections ~Maintenance.pdf
BELL SYSTEM PRACTICES? ? ? ?
SECTION 518-215-405
Plant Series? ? ? ? ? ? ? ?
Issue 1, March 1969
AT&TCo Standard
513-, 514-, AND 515-TYPE KEY SERVICE UNITS
1A2 KEY TELEPHONE SYSTEM
CONNECTIONS AND MAINTENANCE
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