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公开(公告)号：US5176239B1
公开(公告)日：1997-11-18
申请号：US76783591
申请日：1991-09-30
Applicant: ESCALATOR ADVERTISING LTD
Inventor： FINDLAY ALEXANDER , BARTLETT MARK
CPC classification number: B66B23/12 , B65G2207/04 , G09F19/22
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