| 摘要 |
From any conventional structuration and also with any design line, the frame (1) incorporates conveniently integrated to the same a small levelling device (2), preferably a bubble level thereby facilitating considerably a correct fixing of the frame (1) to the wall, as far as its appropriate levelling is concerned. The level (2) can be fixed to the outside of the frame (1) or can remain nested within said frame in such a way that it does not affect its general aspect from an esthetic point of vue, and the location of said level can be invariably in one of its beams (3) or in one of its uprights.
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