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radio waves means electromagnetic waves of frequencies lower than 3 000 GHz that are propagated in space without artificial guide; (ondes radioélectriques)
radio waves means electromagnetic waves of frequencies lower than 3 000 GHz that are propagated in space without artificial guide; (ondes radioélectriques)
radio waves means electromagnetic waves of frequencies lower than 3 000 GHz that are propagated in space without artificial guide; (ondes radioélectriques)