Jordan and Hamburg
Timekeeping signal source for an electronic timepiece
 A timekeeping signal source for an electronic timepiece produces a highly accurate timekeeping signal which is stable in frequency with respect to both temperature variations and long-term drift. The timekeeping signal is produced by phase lock control using a high frequency reference signal from a crystal-controlled high-frequency oscillator. Phase lock control can be performed continuously or on an intermittent basis, in order to reduce power consumption. In addition, the timekeeping rate can be adjusted with a resolution within one period of the high frequency reference signal, by variation of a numeric value stored in digital memory means. 
Citizen Watch Company Limited
G G H
G04G G04G H03L
inventional inventional inventional
Shinichi
Watanabe