the use of mechanical and electrical devices.
ð ə WORD_BOUNDARY j uː s WORD_BOUNDARY ʌ v WORD_BOUNDARY m ɪ k æ n ɪ k ə l WORD_BOUNDARY æ n d WORD_BOUNDARY ɪ l ɛ k t ɹ ɪ k ə l WORD_BOUNDARY d ɪ v aɪ s ɪ z WORD_BOUNDARY