Unclassified
Inmarsat-C
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Unclassified
Inmarsat-C
Satellite communications system
uncommon · Q1663841
Related cards · communications system
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Artifacts
Minitel
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Unclassified
NASA Deep Space Network
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Unclassified
Chappe telegraph
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Unclassified
Optical telegraph
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Unclassified
Duplex (telecommunications)
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Unclassified
Joint Worldwide Intelligence Communications System
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