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发明名称
Vibratory frequency controlling device
摘要
申请公布号
US2222688(A)
申请公布日期
1940.11.26
申请号
US19390268659
申请日期
1939.04.19
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
RUMPEL CARL H.
分类号
H03B5/30
主分类号
H03B5/30
代理机构
代理人
主权项
地址
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