Improvements introduced in data transmission boxes. (Machine-translation by Google Translate, not legally binding)

摘要

Improvements introduced in the data transmission boxes, which are specially designed and intended for the connection of data transmission lines, with the normal and reserve modems, as well as with the order telephone, and being able to carry out the transmissions to 2 or 4 threads, essentially characterized because both the box for 2-wire transmission and the box for 4-wire transmission, have a front from which emerges the corresponding command of a switch of six positions, through which all functions are performed develops one or another box, as well as the sections for tests. (Machine-translation by Google Translate, not legally binding)