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schaltungsanordnung for exchanges, in which lines with vierdrahtmaessigen endverstaerkern for obvious low-frequency fernsprechbetrieb among themselves and with zweidrahtleitungen of constituents are interconnected
schaltungsanordnung for exchanges, in which lines with vierdrahtmaessigen endverstaerkern for obvious low-frequency fernsprechbetrieb among themselves and with zweidrahtleitungen of constituents are interconnected
