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发明名称
Piezo electric crystal apparatus
摘要
申请公布号
US1813461(A)
申请公布日期
1931.07.07
申请号
US19260156032
申请日期
1926.12.20
申请人
FEDERAL TELEGRAPH COMPANY
发明人
NICOLSON ALEXANDER MCLEAN
分类号
H03B5/34
主分类号
H03B5/34
代理机构
代理人
主权项
地址
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