quadruplex
Webster's Unabridged Dictionary:
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Quad·ru·plex
a.
[L., from quattuor four + plicare to fold.]
Fourfold; folded or doubled twice.
Quadruplex system (Electric Telegraph), a system by which four messages, two in each direction, may be sent simultaneously over the wire.
Mentioned in
telegraph
(mechanical device – in communication)
Thomas Alva Edison
(American inventor)
Telegraph
(American history)
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