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公开(公告)号：US1845080A
公开(公告)日：1932-02-16
申请号：US45011430
申请日：1930-05-06
Applicant: BELL TELEPHONE LABOR INC
Inventor： EYRING CARL F , HANSON ROBERT L , MACNAIR WALTER A
CPC classification number: E04B1/99 , E04B2001/8414 , E04B2001/8442 , E04B2001/8452
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