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公开(公告)号：US2242120A
公开(公告)日：1941-05-13
申请号：US34303640
申请日：1940-06-28
Applicant: SIMMONDS DEV CORP LTD
Inventor： LETT GARDINER ERNEST
IPC: H03H9/05
CPC classification number: H03H9/0504
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