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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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FR995323D1949-09-161949-09-16Dispositif de raccordement par deux canaux de transmission pour appareils interphones directs
ExpiredFR995323A
(fr)