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公开(公告)号：US2011459A
公开(公告)日：1935-08-13
申请号：US65019833
申请日：1933-01-04
Applicant: SIDNEY SNOW FREDERICK , WILLIAM HAWKINS PERCIVAL
Inventor： SIDNEY SNOW FREDERICK , WILLIAM HAWKINS PERCIVAL
IPC: E02D5/52
CPC classification number: E02D5/523
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