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bn:26691831n
Noun Concept
EN
optical telegraph
EN
Any telegraph that uses visual signals to convey a message, including the use of smoke signals, beacons or reflected light, which have existed since ancient times. Open English WordNet
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EN
Any telegraph that uses visual signals to convey a message, including the use of smoke signals, beacons or reflected light, which have existed since ancient times. Open English WordNet
IS A
telegraph
Open English WordNet
EN
optical telegraph

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