On December 25, 1969, Seiko released the world's first quartz watch, the Seiko Quartz ASTRON, which marked the beginning of the quartz revolution. The watch uses a crystal oscillator for accuracy, where the crystal generates steady vibration when voltage is applied to it. During the ten years of development at Suwa Seikosha, Seiko managed to create many parts which enabled the viable application of quartz in wristwatches. For example, Seiko cut the crystal oscillator into the shape of a tuning-fork, and developed an integrated circuit and step motor to operate with the signals from the crystal oscillator.