dead man's switch
デッドマン装置
BusKill
Security switch
Train protection system
/suto3/google.icondead man's switch
/suto3/Google画像検索.icondead man's switch
/suto3/Google定義検索.icon dead man's switch
/suto3/wikipedia.icondead man's switch
/suto3/weblio.icon dead man's switch
/suto3/kotobank.icon dead man's switch
/suto3/jisho.icon dead man's switch