发明授权
US08465625B2 Security paper and method and apparatus for producing the same 有权
安全用纸及其制造方法及装置

Security paper and method and apparatus for producing the same
摘要:
A security paper for producing security documents, such as bank notes, identity cards or the like, having at least one opening, whereby the opening is produced during papermaking and does not have a sharp limiting edge in the edge area.
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