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DE549066C
(de )
1932-04-22
Schaltungsanordnung fuer Fernsprechnebenstellenanlagen
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AT16847B
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1904-07-11
Schaltungsanordnung zur Verbindung zweier Fernsprechvermittlungsämter.
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DE604196C
(de )
1934-10-19
Schaltungsanordnung fuer Fernmeldeanlagen