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公开(公告)号：US2535445A
公开(公告)日：1950-12-26
申请号：US72945047
申请日：1947-02-19
Applicant: WILLIAM MILLER , BIERMANN EDWARD W
Inventor： WILLIAM MILLER , BIERMANN EDWARD W
IPC: A01M31/06
CPC classification number: A01M31/06
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