| 摘要 |
PURPOSE: A manual paper shredder using a different blade because of buying from assumption is provided to improve the effectiveness of the protecting personal information the letter envelope in which the vinyl is synthesized or the document envelope. CONSTITUTION: A manual paper shredder using the different blade includes an upper cover(1), a handle(2) and an apparatus for sliding. The top lid makes with the size covering the whole. The home is made and goes in gear with the groove of the safety cover and it unites. It has with the protrusion fixing a spring. In the safety cover, the crevice in which each blade of the apparatus for slicing passes. The spring is clinched on the protrusion within the safety cover.
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