| 摘要 |
<p>It consists essentially in forming in an initially straight pipework duct, by upset pressing in the longitudinal direction, wall thickenings which are subjected to bending to form elbows. The end sides of the elbow merge into the end sides of the neighbouring elbow if a plurality of bends are to be produced. In any case, the respective starting side and the respective end side serve as mounting connection. <IMAGE></p> |
