摘要:
Each of a plurality of components (5) with alphabetical symbols (5A) or the like is provided with a rear stud (7), having a non-circular section on which there can engage a retention discoid (9); in the ribbon-like element (1) there is made a series of holes having a size corresponding to the cross section of said rear studs (7) so as to enable engagement of pre-chosen components in contiguous holes (3) of said ribbon-like element (1).