On May 9, 1978, the first 3000 lines crossbar telephone switching system was opened in Zhangdian District, Zibo City. The outdated hand-cranked telephone started to step off the stage of history.

• 1978年5月9日,山东省第一台3000门纵横制自动电话交换机在淄博市张店区开通使用,老式的“摇把子”式电话机开始退出历史舞台。