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H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
H04Q3/54—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker in which the logic circuitry controlling the exchange is centralised
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Sub-Exchange Stations And Push- Button Telephones
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Schaltungsanordnung für zentral gesteuerte Fernmelde-, insbesondere Fernsprechanlagen, bei denen eine Nebenstellenanlage mit einer privaten Fernmeldeanlage zusammenarbeitet