Kenyon & Kenyon
Electronic switching system
 In a telephone exchange system comprising a time division exchange system and space division concentrators connected to said exchange system with a PCM lines, said concentrators are controlled by said exchange system, thus those volume of hardware in the concentrators can be considerably reduced. Said concentrator comprises a space division switching network having self-latched electronic contacts, which are controlled by a periodical drive pulse from a cyclic readout type memory. 
Nippon Telegraph & Telephone Public Corp. Oki Electric Industry Co., Ltd.
H
H04Q
inventional
Yasunobu Shigefumi Hiromasa Nobuyoshi
Suzuki Fujimoto Ikeda Akiyama