In order to use pins (6) as well as magnets (7) for hanging pieces of paper (5) on a notice board, this is provided with an iron plate (1) in which holes (2) are punched, and where a fibreboard (3) is provided behind the plate (1). Hereby magnets (7) will be able to stick to the iron plate (1), while...http://www.google.es/patents/US4813168?utm_source=gb-gplus-sharePatente US4813168 - Notice board
