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公开(公告)号：US3421072A
公开(公告)日：1969-01-07
申请号：US3421072D
申请日：1966-08-18
Applicant: VALID DATA CORP
Inventor： WOOLAM FRANK J
IPC: H03F3/393 , H03K17/687 , H02M7/44 , H02M7/68
CPC classification number: H03K17/6877 , H03F3/393
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