A hand-held cutter with automatic blade changer which has a casing, short blades each with an aperture, a pushbutton and a plug, and the casing is composed of an outer casing, a fixed blade holder and a retractable blade holder; and it further has a blade changer which is divided into a blade unloading...http://www.google.de/patents/US7721447?utm_source=gb-gplus-sharePatent US7721447 - Hand-held cutter with automatic blade changer
