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公开(公告)号：US2509758A
公开(公告)日：1950-05-30
申请号：US7295949
申请日：1949-01-26
Applicant: PHILIPS LAB INC
Inventor： FRANK BROCKMAN
IPC: H01G7/04
CPC classification number: H01G7/04
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公开(公告)号：US2600473A
公开(公告)日：1952-06-17
申请号：US7296049
申请日：1949-01-26
Applicant: PHILIPS LAB INC
Inventor： FRANK BROCKMAN
IPC: H01F1/34
CPC classification number: H01F1/344
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