| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a blackboard teaching aid for use in tracing/copying teaching in the school education, which is light-weight and is windable, facilitates storing and expanding, and is less degradable even if the winding is repeated while enabling manufacture at low cost.SOLUTION: A blackboard teaching aid is characterized by: comprising at least two horizontally or vertically long and substantially rectangular frame materials, and a rule part made of yarn stretched substantially in a lattice pattern between the frame materials; and attaching a magnet body on the back sides of the frame materials, or forming the frame materials of the magnet body instead of attaching the magnet body on the back sides of the frame materials.</p> |
