发明授权
US2517640A Bookbinding case, the covers of which consist of cardboard, which is doubled by folding it along the edges 失效
装箱盒,其盖子由纸板组成,通过沿边缘折叠将其翻倍

Bookbinding case, the covers of which consist of cardboard, which is doubled by folding it along the edges
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