| 摘要 |
Plane-adjusting members (1, 11, 21 and 41) composed of board members which are flat, long, and narrow on at least right surfaces (2, 12, 22, and 42) thereof are swingably or tiltably fixed to the base members at fixed intervals and a plurality of face boards (K) are fixed on said plane-adjusting members one after another in such manner that butting parts of the face boards are positioned on said plane adjusting members. Inclination, projection, and/or recess of the base are offset by the plane-adjusting members, whereby the difference between levels of the butting parts of face boards can be eliminated. |
