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经营范围
发明名称
Diaphragme acoustique et son procédé de fabrication.
摘要
申请公布号
CH159706(A)
申请公布日期
1933.01.31
申请号
CHD159706
申请日期
1931.07.20
申请人
LEKTOPHONE CORPORATION
发明人
CORPORATION LEKTOPHONE
分类号
主分类号
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代理人
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