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621.391.6 --- 621.391 --- Transmission of electric signals by various waves, e.g. ultraviolet, visible light, infra-red --- General questions of electrical communication engineering. Cybernetics. Information theory. Signal theory --- 621.391 General questions of electrical communication engineering. Cybernetics. Information theory. Signal theory --- 621.391.6 Transmission of electric signals by various waves, e.g. ultraviolet, visible light, infra-red

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Telecommunication technology --- telecommunicatie --- analoge technieken --- hoogdoorlaatfilters --- Electronics --- modulatie --- technologische innovatie --- amplitudemodulatie --- elektrische golftechniek --- frequentiefilters --- digitale technieken --- AC (alternating current) --- laagdoorlaatfilters --- Telecommunicatie --- Telecommunication --- Télécommunications --- analoge techniek (analoge elektronica) --- digitale techniek --- Telecommunicatie.