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发明名称
Fernsprech-Mithoerschutz
摘要
申请公布号
DE856454(C)
申请公布日期
1952.11.20
申请号
DE1951D009631
申请日期
1951.06.24
申请人
DONATH WILHELM
发明人
DONATH WILHELM
分类号
H04M1/68
主分类号
H04M1/68
代理机构
代理人
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地址
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