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公开(公告)号：US2515673A
公开(公告)日：1950-07-18
申请号：US65063146
申请日：1946-02-27
Applicant: JAMES KNIGHTS COMPANY
Inventor： SYLVESTER FREDERICK F
IPC: H03H9/05
CPC classification number: H03H9/0528 , Y10S439/913
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