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| All kinds of certificates and carbon-covered ,sensitization and desensitization ink printing secret envelopes |
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| 　 Name:Secret envelopes |
| All kinds of certificates and carbon-covered ,sensitization and desensitization ink printing secret envelopes |
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| 　 Name:Ordinary envelopes |
| All kinds of Chinese and western style envelopes with different specifications |
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| 　 Name:Ordinary envelopes |
| All kinds of Chinese and western style envelopes with different specifications |
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