A wood shingle panel includes an elongated backing sheet and a face layer adhesively bonded together, the face layer being composed of a double course of half-length shingle sections formed by severing standard full-length tapered wood shingles midway between their tip and butt ends. The butt end portions...http://www.google.es/patents/US4459788?utm_source=gb-gplus-sharePatente US4459788 - Plywood-backed double course shingle panel
