| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an electronic time recorder capable of correcting automatically the incorrect indication of a clock. SOLUTION: This time recorder is formed so as to incorporate a radio clock and to automatically calibrate the time by a reference time radio wave. A control means for printing a calibration mark in addition to the present time on a time card at the automatic time calibration time is installed. Since the calibration mark is not printed when the time of the clock is changed artificially, the time recorder is effective for detection of fraudulent attendance/ leaving data and prevention of a fraudulent time changing operation.</p> |
