Impulse regenerators with mechanical or other non-electrical marking arrangements

Full Title

Details of selecting apparatus or arrangements > Electrical details > Signalling arrangements; Manipulation of signalling currents (multiplex systems providing for calling or supervisory signals H04J1/14, H04J3/12) > using trains of DC pulses (H04Q1/39 takes precedence) > Impulse regenerators with mechanical or other non-electrical marking arrangements