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Slide Fasteners, Snap Fasteners, And Hook Fasteners
(AREA)
Abstract
Improved thumbtack, for its application to soft masses, characterized essentially by the fact of being constituted by a one-piece body of molded material, which has a head from whose center is born one that on its surface comprises a series of truncated-conical steps that operate as means for retaining the piece in the mass of the newly intended material. (Machine-translation by Google Translate, not legally binding)