| 摘要 |
The extension tube (6) is located vertically with the lower end of the wooden column inserted in the ground, and also extends slightly above ground level (5). On the column lower part is attached a suspension part (7), and the column lower part is inserted downwards into the upper part of the tube so that with the aid of the suspension part it is locked in a position where it is at a level above the plane of the earth. |
