| 摘要 |
A method of binding plurality of pages such that the pages lie flat when book is open which comprise of creating window cut or window slit on the page at a space parallel to the spine of book, die hole punching between the window slit and spine, accomplishing v shaped spine, and stapling between the die hole punching and window slit and a machine which has assembly to window cut, die hole punch and staple resulting in step binding. |
