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公开(公告)号：US2694024A
公开(公告)日：1954-11-09
申请号：US30112852
申请日：1952-07-26
Applicant: BELL TELEPHONE LABOR INC
Inventor： BOND WALTER L , MORGAN SPARKS , TEAL GERDON K
IPC: C30B15/36
CPC classification number: C30B15/36
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