English to Chinese Bus/Financial Finance (general) General

(a) Each Blocker Seller shall deliver to Buyer certificates representing its respective Blocker Securities, duly endorsed in blank or accompanied by stock powers duly endorsed in blank in proper form for transfer.
每一名BS将向买方交付经正式签字空白背书的其各自B证券的证书，或随附经正式签字空白背书的适当格式方便转让的股票转让授权书。
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Blocker Seller 怎么翻译？谢谢。