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发明名称
Improvements in or relating to electromagnetic rapping devices and systems
摘要
申请公布号
GB684066(A)
申请公布日期
1952.12.10
申请号
GB19510008807
申请日期
1951.04.16
申请人
RESEARCH CORPORATION
发明人
分类号
B03C3/76
主分类号
B03C3/76
代理机构
代理人
主权项
地址
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