书页折角 dog-ear

页角弄折了的 dog's-eared

书页的折角 dog's-ear ; dog-eared

折页三角板 former plate

折页三角板夹纸辊 bending rollers

书页折角的 dog-eared

书翻旧而页角折卷的 dog-eared

双三角板折页机组 Doppeltrichterfalzapparat

三角板折页装置 former folder