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  2. ECHELON - Wikipedia

    en.wikipedia.org/wiki/ECHELON

    The ability to intercept communications depends on the medium used, be it radio, satellite, microwave, cellular or fiber-optic. [7] During World War II and through the 1950s, high-frequency ("short-wave") radio was widely used for military and diplomatic communication [ 57 ] and could be intercepted at great distances. [ 7 ]

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