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Today in history, on August 11, 1942, actress Hedy Lamarr and composer George Antheil received a US patent for a "secret communication system" that used frequency hopping spread spectrum technology. Their invention involved rapidly switching between different radio channels in a predetermined sequence to avoid jamming and interception of secret messages. Although their system was not used in battle due to its unwieldiness, it paved the way for modern wireless communication technologies such as Wi-Fi, Bluetooth & GPS.

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