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7DU telephone exchange schematic diagram

Inventory number: T99 1/14/2
Year of creation: 1938
Location: Hall 1

In country towns the 7B type exchanges built in the period from 1929 to 1930 were followed by the enhanced 7DU exchange system, which was able to switch long-distance calls as well. The first of them was put into service 1938 in Pápa.

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  • 7DU telephone exchange schematic diagram

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