YD-Ⅲ型音频调度电话及YG-I型各站养路电话

兰州铁道学院电机系，铁道部北京二七通信工厂编著

Book 1 of 224

ISBN

Publisher: 人民铁道出版社

Published: Oct 15, 1979

Description:

11846472,000000915656