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of each section of line needed to be small.

Nyquist worked on several parts of this problem. His patents from the 1920s covered an automatic gain regulator in which a motor and relays changed an artificial-line attenuator as line loss varied, a bidirectional repeater intended to cope with unequal lines and reflections, and lattice networks for correcting phase-delay distortion. These were practical parts of keeping signal level, timing, and waveform under control over a long route.

Carrier systems also had to reproduce their carrier

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