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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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FR1007879D1948-04-091948-04-09Perfectionnements aux installations téléphoniques à deux fils en haut-parleur
ExpiredFR1007879A
(fr)