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The qualification certification of the assignor or any other valid certification .

出让方的资格证明或者其他有效证明。

Assignment refers to the act by which an assignor transfer a contract right to an assignee .

转让是指转让人向受转让人转让合同权益的行为。

Legal rights of the assignor and assignee .

分配人与受让人双方的合法权利。

To exchange the land use rights , assignor shall sign an assignment contract with assignee again .

交换土地使用权的，出让人应当与受让人重新签订出让合同。

The auctioneer entrusted by the assignor shall issue a notice of auction .

由出让人委托的拍卖人发布拍卖公告。