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Publication of CH304895ApublicationCriticalpatent/CH304895A/fr
H04M9/00—Arrangements for interconnection not involving centralised switching
H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
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Engineering & Computer Science
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Signal Processing
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Organic Low-Molecular-Weight Compounds And Preparation Thereof
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CH304895D1951-05-231952-05-20Procédé de communication et poste téléphonique à haut-parleur pour la mise en oeuvre de ce procédé.
CH304895A
(fr)