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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H04M7/0042
where the data service is a text-based messaging service
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H04M7/0045
where the text-based messaging service is an instant messaging service
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