| 摘要 |
Set square, for example trysquare, including two perpendicular branches (1, 2), characterised in that a graduated rule or small rule (3) is mounted with a capability of sliding longitudinally in one (1) of the said branches, the said rule (3) thus being able to occupy a retracted position inside the said branch (1) or a deployed position out of this branch, over an adjustable length, with respect to the outer edge (2c) of the other branch (2). <IMAGE>
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