無む線せん電でん信しん

noun, noun which may take the genitive case particle 'no'

radio telegraphy; wireless telegraphy

Technical term for early wireless communication using Morse code or similar signals. Now largely historical, replaced by modern radio communication terms.

• 無む線せん電でん信しんは20世せい紀き初しょ頭とうに船せん舶ぱく通つう信しんで広ひろく使つかわれた。

  Radio telegraphy was widely used for ship communication in the early 20th century.