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公开(公告)号：US2658125A
公开(公告)日：1953-11-03
申请号：US32883952
申请日：1952-12-31
Applicant: WHITFIELD EDWARD C
Inventor： WHITFIELD EDWARD C
IPC: H01H85/20
CPC classification number: H01H85/201
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公开(公告)号：US2823001A
公开(公告)日：1958-02-11
申请号：US51917755
申请日：1955-06-30
Applicant: WHITFIELD EDWARD C
Inventor： WHITFIELD EDWARD C
IPC: E21F17/06
CPC classification number: E21F17/06
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