An extendable-bristle brush having a hollow, tubular handle containing a folded bundle of fibers, the free ends of the fibers extending from an open end of the handle as bristles. The bundle is formed by folding a half-bundle of fibers about a hooked drawpiece and drawing the fold of the bundle into...http://www.google.fr/patents/US5913348?utm_source=gb-gplus-shareBrevet US5913348 - Brush having extendable bristles and method for making such a brush
Brush having extendable bristles and method for making such a brush
