medalist cover
... 文献集邮literature phellolately 镶嵌封medalist cover 小规模张miniature sheet ...
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... 挂号信封 Registration envelope 镶嵌封 Inlaid cover 特种挂号信封 Special registration mail envelope ...
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密封镶嵌 closed set
液态镶嵌式密封 Liquid-Mounted Seal
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