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Patent classifications
H
ELECTRICITY
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H04
ELECTRIC COMMUNICATION TECHNIQUE
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H04B
TRANSMISSION
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7/00
Radio transmission systems, i.e. using radiation field
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H04B7/14
Relay systems
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H04B7/15
Active relay systems
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H04B7/155
Ground-based stations
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H04B7/17
employing pulse modulation, e.g. pulse code modulation
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