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公开(公告)号:US2270046A
公开(公告)日:1942-01-13
申请号:US30697039
申请日:1939-11-30
Applicant: HONORARY ADVISORY COUNCIL SCI
Inventor: HEW GRACE NATHANIEL
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公开(公告)号:US2204214A
公开(公告)日:1940-06-11
申请号:US30684039
申请日:1939-11-30
Applicant: HONORARY ADVISORY COUNCIL SCI
Inventor: HEW GRACE NATHANIEL
IPC: A01N25/00
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