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公开(公告)号：US2609256A
公开(公告)日：1952-09-02
申请号：US22363751
申请日：1951-04-28
Applicant: BELL TELEPHONE LABOR INC
Inventor： BAKER WILLIAM O , WINSLOW FIELD H
CPC classification number: G01R1/10 , F16C33/32 , F16C2206/04 , F16C2240/70 , Y10T29/49694 , Y10T29/49702 , Y10T29/4971
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