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公开(公告)号：US2621268A
公开(公告)日：1952-12-09
申请号：US17196250
申请日：1950-07-03
Applicant: ERICSSON TELEFON AB L M
Inventor： LJUSLIN LINDSTROM DAG VIKTOR , IVAR JEDVALL GUSTAF
IPC: G01L19/08
CPC classification number: G01L19/08
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