pdf 518-310-113 ~ 247A KTU I.D., Installation, Maintenance Popular
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518-310-113 ~ 247A KTU I.D., Installation, Maintenance.pdf
BELL SYSTEM PRACTICES
SECTION 518-310-113
Plant Series
Issue 1, February 1968
AT&TCo Standard
247A KEY TELEPHONE UNIT IDENTIFICATION, INSTALLATION, AND MAINTENANCE
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