| 摘要 |
A writing or drawing sheet imprinted with a pattern of parallelograms (12) defined by a grid consisting of two crossing groups of parallel lines (10,11). The grid lines are made up of uniformly spaced dots (13) and each corner of the parallelograms (12) is marked by a dot common to the two lines defining the sides of the parallelogram (13) adjacent to the corner. |
