Patent classifications
H
ELECTRICITY
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H04
ELECTRIC COMMUNICATION TECHNIQUE
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H04M
TELEPHONIC COMMUNICATION
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7/00
Arrangements for interconnection between switching centres
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H04M7/0024
Services and arrangements where telephone services are combined with data services
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H04M7/0057
Services where the data services network provides a telephone service in addition or as an alternative, e.g. for backup purposes, to the telephone service provided by the telephone services network
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