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Production of wrist watches
     It happened in 1918. The American engineer after an electrician Эллис Уоррен opened whole new epoch on business of creation of clock. He began making of first in the world of the minute-jumpers fitted for the use. A pendulum in the created device for counting out of time was operated by an electromagnet. Such clock advantageously differed in exactness, not сбегали forward, did not pasture back, and, most important, they did not need to be constantly led.