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Priority claimed from DE1903158799Dexternal-prioritypatent/DE158799C/de
Application filed by Zwietusch E & Co GmbhfiledCriticalZwietusch E & Co Gmbh
Application grantedgrantedCritical
Publication of AT23474BpublicationCriticalpatent/AT23474B/en
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AT23474D1903-11-121905-03-27
Circuit for the operation of telephone auxiliary switching points.
AT23474B
(en)