| 摘要 |
Provided is a blackboard composed of a blackboard eraser (1) with long length; a switch (2) mounted onto the bottom surface; and a supporting board (3), wherein the blackboard eraser (1) is operated vertically by using the switch (2). The supporting board (3) has a structure of gathering all kinds of the eraser residues which comes out after erasing the blackboard by the blackboard eraser (1) with long length. Thus the blackboard eraser enables a user to easily and effectively erase the blackboard at once by the switch. |
