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Private branch exchanges for connection to the British telecommunications public switched telephone network : part - 1 : specification for general requirements

Private branch exchanges for connection to the British telecommunications public switched telephone network : part - 1 : specification for general requirements - - London BSI 1983 - 22 p. - SBI 6450 : part - 1 : 1983 .

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Universal Decimal Class. No.: DSBI 6450 : part - 1 : 1983

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