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quadruplex

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(communications)quadruplex - A kind of telegraphy system developed by Thomas A. Edison in the 1870s combining diplex and duplex communications to support simultaneous transmission of two messages in each direction.
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Designed for duplex, triplex or quadruplex lines and having a number of patented features, they combine the tread components under high static pressure, with accurate dimensions and without air inclusions.
Patented rubber compounding machines and extruders described by Rubber World
It was Jay Gould, the robber baron, and the young inventor suffered considerable loss in a dispute between Western Union and Gould's Atlantic & Pacific system over Edison's quadruplex telegraph.
The man who lit up the world: Thomas Edison changed the world through ... by Hoar, William P. / The New American
For instance, the M-346's superior aerodynamic design combined with a quadruplex re-configurable digital fly-by-wire (FBW) flight control system enhances manoeuvring performance and flying qualities, including flying at high angle of attack (over 40 degrees) under full control.
Aermacchi Recognised with Frost & Sullivan Product Innovation Award ... by Business Wire
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