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公开(公告)号：US3324499A
公开(公告)日：1967-06-13
申请号：US40188864
申请日：1964-10-06
Applicant: WARD WEST GEOFFREY
Inventor： WARD WEST GEOFFREY
CPC classification number: A47L11/4044 , A47L1/08 , A47L11/30 , A47L11/4088
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