継けい電でん鍵けん

noun

relay key

Technical term used in telegraphy and early electrical communication systems; a key that operates a relay.

• 継けい電でん鍵けんは、電でん信しんで信しん号ごうを中ちゅう継けいするために使つかわれた。

  The relay key was used to relay signals in telegraphy.