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发明名称
Testing and adjusting device
摘要
申请公布号
US1930267(A)
申请公布日期
1933.10.10
申请号
US19300503754
申请日期
1930.12.20
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
GIBSON ROBERT D.;HARLEY JOHN B.
分类号
E21C25/06;G11B7/00
主分类号
E21C25/06
代理机构
代理人
主权项
地址
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