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公开(公告)号：US3008893A
公开(公告)日：1961-11-14
申请号：US3778560
申请日：1960-06-21
Applicant: BELKE MFG CO
Inventor： BELKE WILLIAM E , LEOPOLD LANG
IPC: C25D17/20
CPC classification number: C25D17/20 , Y10S366/601
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