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公开(公告)号：US2937710A
公开(公告)日：1960-05-24
申请号：US62725456
申请日：1956-12-10
Applicant: MICHAEL RALPH A , NEWKIRK JAMES A , PRESTON WILLIAM E
Inventor： MICHAEL RALPH A , NEWKIRK JAMES A , PRESTON WILLIAM E
IPC: B03C1/28
CPC classification number: B03C1/28
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