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Priority to PL18712776ApriorityCriticalpatent/PL98645B1/pl
Publication of PL98645B1publicationCriticalpatent/PL98645B1/pl
PL18712776A1976-02-091976-02-09Uklad do telefonicznej i glosnomowiacej lacznosci dyspozytorskiej na wspolnej dwuprzewodowej linii abonenckiej
PL98645B1
(pl)