摘要 |
<p>The joint (D) has two metal strips running parallel to each other, where a distance between upper and lower edges of the metal strips amounts to 1.5 centimeters to each other. The metal strips maximally rest on edges of a frame (B) and closed with the frame edges. The metal strips have the width of 4 centimeters, and form a tube section and upper and lower edges of a cross beam.</p> |