Advanced clock measurement system

Auxiliary timing source for ac-powered electronic clocks

Basic circuit for electronic timepieces

Circuit arrangement for adjusting a pulse frequency of a quartz-

Clock apparatus for forming time information for use in computer

Correction apparatus and clock device using the same

Digital frequency trimmed electronic timepiece

Electronic timekeeping device reduced adjustment data storage re

Electronic timepiece

Electronic timepiece

Electronic timepiece

Electronic timepiece

Electronic timepiece

Electronic timepiece having a digital frequency correction circu

Electronic timepiece having improved primary frequency divider r

Electronic timepiece with frequency correction

Electronic timepiece with temperature compensation

Electronic wristwatch

Error correction method and apparatus for electronic timepieces

Logical regulation circuit for an electronic timepiece