pdf 518-220-400 400A, B, C, And D Type KTU Popular
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518-220-400 400A, B, C, and D Type KTU.pdf
BELL SYSTEM PRACTICES? ? ? ?
SECTION 518-220-400
Plant Series? ? ? ? ? ? ? ?
Issue 2, September, 1966
AT&TCo Standard
400A, B, C, AND D TYPE KEY TELEPHONE UNITS
IDENTIFICATION, INSTALLATION, CONNECTIONS, AND MAINTENANCE
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