Abstract: Display rack for shelves comprising a base designed to constitute a storage plane for objects of various widths. The base is composed of a plurality of juxtaposed elements and at least one sliding rim. Each of the juxtaposed elements comprises a first edge and a second edge formed in such a way that they can accommodate the sliding rim.
Abstract: Locks of hair from synthetic fibers grouped into a bundle are welded and then cut by ultrasonic waves in a two step process. The fiber bundle is placed on a platform having a pointed ridge, and a component comprising the emitter and an ultrasonic tool is moved downwardly in two stages. The emitter is deactivated during the return to its upper position.