Zong heng zhi dian hua jiao huan ji di dian zi dian lu
By: Shi Qingquan bian [xie].
Edition: Di 1 ban.
Publisher: Ren min you dian chu ban she; Xin hua shu dian Beijing fa xing suo fa xing
Published: 1982
Place of publication: Beijing
Language: chi
Number of pages: 423
Subjects: Telephone switching systems, Electronic.; Telephone -- Private branch exchanges.; Electronic circuits.