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1.发明授权
公开(公告)号：US2689590A
公开(公告)日：1954-09-21
申请号：US31193752
申请日：1952-09-27
Applicant: WHITAKER JAMES N
Inventor： WHITAKER JAMES N
IPC: B27L1/00
CPC classification number: B27L1/005
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