Circuit arrangement for subscriber - connecting lines with two symmetrical two-wire lines for additional characters transmission, in particular for image remote speaker

公开/公告号JPS537090B2

专利类型

公开/公告日1978-03-14

原文格式PDF

申请/专利号JP19720127063

申请日1972-12-18

分类号H04B3/44;H04L5/20;H04M3/00;H04M7/08;H04M11/08;H04M19/00;H04N7/14;H04Q3/00;

国家 JP

入库时间 2022-08-22 23:00:45