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Priority to ES100719UpriorityCriticalpatent/ES100719Y/en
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Publication of ES100719YpublicationCriticalpatent/ES100719Y/en
A rule of proportions, characterized essentially by being constituted by a graduated strip, on whose flat face is disposed a normally graduated elastic strip, fixed by one of its ends in the aforementioned strip itself, while the other end is attached to a piece slider that causes, when desired, the elasticity of said belt establishing a ratio between the two mentioned graduations. (Machine-translation by Google Translate, not legally binding)