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Used for talking to each other
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Used for talking to eachother when under silent conditions
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Tie a letter on to a pigeons foot and they will send your letter
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Code for Morse Code
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Used to talk to eachother with out noise.
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Used for secret messages
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Ship air horn for on ships
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Used for letting aeroplanes where to land
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Used for talking to eachother form far away
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To speak to families over the world etc
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