| 摘要 |
The plugging unit obscures electrical socket channels (15) which are not in use. Each unit has the form of a rod (27a) and has two spaced circular sections (28) in the centre. There are two outer sections where the rod diameter narrows with an end circular section (24a). When inserted the two spaced circular sections seal the central joint section (12) between the inner and outer part of the plug channel.
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