Material in sheet form having a window, its manufacturing method, and security document comprising it.

具有窗口的片状材料，其制造方法，以及包括该片状材料的安全文件。

youdao

Material in sheet form having a window, its manufacturing method, and security document comprising it.

具有窗口的片状材料，其制造方法，以及包括该片状材料的安全文件。

youdao