| 摘要 |
<p>Form elements have inward facing battens on their vertical edges, joined to them by connecting cross arms at right angles. The battens are engaged by spacer connecting elements which join adjacent form elements together. The connecting elements incorporate a bar-shaped lengthways beam with two bar-shaped pairs of cross arms joined to it. The cross arms are fitted with bars vertically to themselves and to the beams. The bars in any one cross arm pair fit from two sides against battens on the form elements. These are fitted with interior surfacings of insulating material, with grooves on the vertical edges matching the battens in cross-section.</p> |
