| 摘要 |
The metal plates used each comprise a body on each side of which is at least one fold. The folds on one side converge towards those on the other side, and those on the same side of the body are parallel to one another. - The plates are driven into the chipboards from above, and at right-angles to the longitudinal dirction of the seam, with the body intersecting the seam, and the seams converging upwards. |
