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This call letter business got codified in 1912, at a “radiotelegraph” conference in London not long after RMS Titanic sank, so the power of wireless communication was very much on delegates’ minds.

In the late 19th century, Guglielmo Marconi invented radiotelegraph equipment, which could send Morse code over radio waves, rather than wires.

Paris officials decided to save it, however, after realising that the tower, at the time tallest building in the world, could be used as a radiotelegraph station.