Craig & Antonelli
Current supply system for terminal devices
 A current supply system for terminal devices in which the line circuits are divided into groups in accordance with the line impedance thereof between an exchange or switching network and respective terminal devices or telephone sets, and a different voltage is applied to respective groups of line circuits which corresponds to the current matching the line impedance for the respective groups of line circuits. 
Hitachi, Ltd.
H H
H04M H04M
inventional inventional
Hirotoshi Hidetaka Takeshi Tatsumasa
Shirasu Yamashita Fukuhara Oonuma