BS 6450-7:1990
Withdrawn Standard
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BS 6450-7:1990

Private branch exchanges for connection to public switched telephone networks run by certain telecommunication operators Specification the procedure in-service observation of PBXs undergoing type approval
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Technical characteristics

Publisher British Standards Institution (BSI)
Publication Date 10/28/1990
Cancellation Date 05/01/2009
Page Count 14
Themes Telephony
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ISBN ---
Weight (in grams) ---
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