[电] pilot and telephone block system

xiāng dǎo jí diàn huà xíng chē zhì ㄒㄧㄤ ㄉㄠˇ ㄐㄧˊ ㄉㄧㄢˋ ㄏㄨㄚˋ ㄒㄧㄥˊ ㄔㄜ ㄓˋ