H
ELECTRICITY
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H04
ELECTRIC COMMUNICATION TECHNIQUE
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H04L
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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H04L51/00
User-to-user messaging in packet-switching networks, transmitted according to store-and-forward or real-time protocols, e.g. e-mail
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H04L51/21
Monitoring or handling of messages
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H04L51/212
using filtering or selective blocking
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