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COMorse code began in 1837 when Samuel Morse introduced a system of short and long signals for telegraph lines. It expanded fast during the 1840s as rail networks and telegram traffic grew. International standards appeared in 1865 with a unified set of symbols. Radio operators adopted the system in the early 1900s because short signals traveled far with little equipment. Aircraft navigation beacons started sending identifiers in the 1920s. Marine emergency traffic adopted SOS in 1906 and used it across global waters through the twentieth century. Amateur radio groups kept the method active after voice radio spread in the 1930s. Military training used it across both world wars for field signals. Assistive input systems adopted timed taps in the late twentieth century to support communication for people with limited movement or speech. The method stays stable because short patterns hold up in noise and require minimal gear.
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