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PCE
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DIFF Subgroup
H04M 9/10

with switching of direction of transmission by voice frequency

Introduced: September 1968

Full Title

Arrangements for interconnection not involving centralised switching > Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic > with switching of direction of transmission by voice frequency

No child classifications to compare. This is a leaf node in both IPC and CPC.