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#podcasting #communication signal

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#morse code #signal dot #telegraph key #short pulse #communication signal

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#walking talking #communication signal #voice transmission #portable radio #field communication

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#headlight flash #high beams flash #flashing lights #road courtesy signal #communication signal #oncoming signal

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#signalling #hand gesture meaning #nonverbal cue #communication signal #pointing gesture

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#telephone network #phone infrastructure #utility line #communication signal #telephone pole line

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#DTMF #number tones #phone frequency #telephony signaling #communication signal #sound transmission