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Priority to ES0008722UpriorityCriticalpatent/ES8722Y/en
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Publication of ES8722YpublicationCriticalpatent/ES8722Y/en
A new type of universal bicycle frame, essentially characterized by that instead of carrying as usual a straight or curved tube from the direction of the saddle, takes two paired tubes. (Machine-translation by Google Translate, not legally binding)
Supplementary table, adaptable to individual bicycles, for transformation into "tandem". (Machine-translation by Google Translate, not legally binding)