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公开(公告)号：US2447160A
公开(公告)日：1948-08-17
申请号：US62361845
申请日：1945-10-22
Applicant: PHILIPS LAB INC
Inventor： CHALFIN NORMAN L
IPC: H03H9/10
CPC classification number: H03H9/0528 , H03H9/1014
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