| 摘要 |
<p>The pipe system (2) comprises two external cardboard pipes (3), which are formed from wound paper layers. A round connecting pipe or member (6) is provided. The two external cardboard pipes have recesses, which dovetail with each other, such that they are connected with each other by the connecting pipe or member. The two external cardboard pipes, in the connected condition, pivot against each other around the connecting pipe or member.</p> |
