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Radio-Controlled Transistor Pendulum Clock

The clock was driven by a battery instead of a mainspring and gained improved accuracy from a pendulum with a transistor. The error caused by temperature fluctuation was corrected by mechanically resetting the hands, thanks to the official time transmitted by NHK via transistor radio waves.

Name Radio-Controlled Transistor Pendulum Clock
Time/Period 1966
Additional information The clock was corrected based on a time signal transmitted by NHK radio for 90 seconds twice a day, at 7 a.m. and 7 p.m. Thanks to its high accuracy, the clock was widely used at watch & clock stores, schools, and homes.