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发明名称
Piezoelectrical apparatus
摘要
申请公布号
US2488586(A)
申请公布日期
1949.11.22
申请号
US19460711677
申请日期
1946.11.22
申请人
HARTFORD NATIONAL BANK AND TRUST COMPANY
发明人
DIEMER GESINUS
分类号
H04R17/02
主分类号
H04R17/02
代理机构
代理人
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地址
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