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公开(公告)号：US3316509A
公开(公告)日：1967-04-25
申请号：US28201263
申请日：1963-05-21
Applicant: SANDERS ASSOCIATES INC
Inventor： AYER DONALD R , RALPH LOWE W
IPC: H01P1/18
CPC classification number: H01P1/183
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