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经营范围
发明名称
Four pole transducer
摘要
申请公布号
US2944194(A)
申请公布日期
1960.07.05
申请号
US19580749539
申请日期
1958.07.18
申请人
LING-ALTEC ELECTRONICS, INC.
发明人
ROSS JAMES A.
分类号
B06B1/04
主分类号
B06B1/04
代理机构
代理人
主权项
地址
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