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发明名称
Timing mechanism
摘要
申请公布号
US1917008(A)
申请公布日期
1933.07.04
申请号
US19300448508
申请日期
1930.04.30
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
BECK WILLIAM O.
分类号
H04M3/12
主分类号
H04M3/12
代理机构
代理人
主权项
地址
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