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What does it mean to write Donggang Printing on the certificate of deposit of Agricultural Bank of China?

The certificate of deposit of China Agricultural Bank says Donggang Printing, which means that the credit certificate of China Agricultural Bank for saving business is printed by Donggang Securities Printing Co., Ltd., and the certificate of deposit of Agricultural Bank is printed by Donggang Securities Printing Co., Ltd., so the certificate of deposit of Agricultural Bank says Donggang Printing, which means that the credit certificate of Agricultural Bank for saving business is printed by donggang city Security Printing Co., Ltd., and donggang city Security Printing Co., Ltd. is a packaging and printing service provider.