作者: Joseph Gorman
DOI:
关键词: Geology 、 Geometry 、 Structural engineering
摘要: A folder for holding papers is made from a single sheet, and includes first second side pockets which fold about common center line have their respective openings disposed on opposite lateral edges of the folder. Each pocket provided with flap folds inwardly so that they seal associated when closed its line. binder member may be secured along between serve as cover held in binder.