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Application filed by Siemens AgfiledCriticalSiemens Ag
Publication of SE306358BpublicationCriticalpatent/SE306358B/xx
Improvements in or relating to a method and apparatus for selecting and establishing a free transmission path through a plurality of stages of switching multiples
Circuit arrangement for testing switching circuits and/or lines with regard to their engaged condition, in tele-communication systems, particularly in telephone exchange systems