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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H04L5/00
Arrangements affording multiple use of the transmission path
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H04L5/0001
Arrangements for dividing the transmission path
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H04L5/0014
Three-dimensional division
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H04L5/0023
Time-frequency-space
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