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Publication of BE563860ApublicationCriticalpatent/BE563860A/fr
Fernsteuersystem fuer einen fernsehempfaenger zur wahlweisen steuerung mehrerer externer geraete und zur steuerung externer geraete ueber die netzwechselspannungsleitung
Procede et dispositif pour etablir des communications bidirectionnelles et/ou multidirectionnelles entre differentes personnes regroupees en differentes stations geographiquement eloignees et reliees entre elles par des lignes telephoniques