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Insulated copper cables laid along the bottom of a sea or ocean for telegraphic communication. The first short cable was laid across the English Channel in 1851; the first successful transatlantic cable was laid in 1866. In the late 1980s this techno

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1. Insulated copper cables laid along the bottom of a sea or ocean for telegraphic communication. The first short cable was laid across the English Channel in 1851; the first successful transatlantic cable was laid in 1866. In the late 1980s this techno





 
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