Set of electronic devices and modifications that allow the adaptation of rotary systems 7d for the use of multi-frequency keyboard telephones. (Machine-translation by Google Translate, not legally binding)

摘要

"SET OF DEVICES AND NOTIFICATIONS THAT ALLOW THE ADAPTATION OF ROTARY SYSTEMS 7D FOR THE USE OF MULTI-FREQUENCY TELEPHONES": characterized essentially because it comprises, a category generator composed of two phase generators, a control and alarm circuit, a phase distributor, identification circuits and category relays, cord seekers and conventional receivers, keyboard receivers composed in turn by electromechanical functional blocks and electronic detectors, modified computing circuits, connection circuits and modified recorders of normal use in rotating central 7D. (Machine-translation by Google Translate, not legally binding)