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a wide variety of modern systems depend for their operation on an invention devised at Bell Laboratories more than 50 years ago it continues to be used throughout the Bell System and telephone sets the newest switching machines and modern systems for transmitting telephone calls this is an early version of that invention called a negative feedback amplifier in the early days of long-distance calling only a few voices could be carried on one pair of wires as long distance calling grew high-capacity systems were needed to carry many telephone calls simultaneously but signals used in high capacity systems need to be amplified more frequently and the available amplifiers distorted the signals in 1921 harold black began working on an efficient distortion-free amplifier that would permit long-distance transmission of large numbers of telephone calls at low cost I tried again and again to build practical or viable amplifiers that would accomplish what I was trying to do and each and every one