| 摘要 |
The invention relates to a machine readable record which involves data symbolic marks containing a summary constant number of dark elements through the whole record that consists of a record medium such as paper or other record printing substrate, of data symbolic marks printed on such record medium, arranged onto a grid on positions by periodically repeating characteristics in the horizontal as well as vertical direction, of text or graphic print printed in an overlay with data symbolic marks, of elements of record modulation by a graphic pattern. |
