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经营范围
发明名称
Tuning fork in vacuum
摘要
申请公布号
US2034282(A)
申请公布日期
1936.03.17
申请号
US19330694158
申请日期
1933.10.18
申请人
THE WESTERN UNION TELEGRAPH COMPANY
发明人
BUCKINGHAM WILLIAM D.
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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