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公开(公告)号：US3502979A
公开(公告)日：1970-03-24
申请号：US3502979D
申请日：1967-04-26
Applicant: CARY INSTRUMENTS
Inventor： HOLLY JOHN A
CPC classification number: H03K9/02 , G01R19/0053 , G01R19/22
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