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attention: ＊＊＊＊＊＊a formal visa invitationdear sir or madam:we are very pleased to invite mr. ＊＊＊ come to our factory for visiting and business negotiation. the business trip will start from 18th april XX . and because the long business co-operation in future between ＊＊对方公司名 and us, they will come to china for many times.please note, however, that we ..