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едноезични примери (не са проверени от PONS редакцията)
Minutes and seconds could not be accurately assessed until the seventeenth century, when the pendulum clock was invented.
www.newyorker.com The tower has a mechanical pendulum clock that is made of a series of wheels, gears and springs and a real bell.
www.stcatharinesstandard.ca With these improvements, by the mid-18th century precision pendulum clocks achieved accuracies of a few seconds per week.
en.wikipedia.org Examples include the swings of a pendulum clock, the tuning circuit of a radio, and the heartbeat while resting.
en.wikipedia.org Networks of electric clocks connected by wires to a precision master pendulum clock began to be used in institutions like factories, offices, and schools around 1900.
en.wikipedia.org