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1.发明授权Combination spring abutment and pointer-securing means for electrical instruments 失效用于电气仪器的组合弹簧基座和指针固定装置
公开(公告)号：US2890416A
公开(公告)日：1959-06-09
申请号：US54889255
申请日：1955-11-25
Applicant: DAYSTROM INC
Inventor： WALKER ROBERT D
IPC: G01R11/02
CPC classification number: G01R11/02 , Y10S411/918
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