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经营范围
发明名称
Electroacoustic transducer
摘要
申请公布号
US2549963(A)
申请公布日期
1951.04.24
申请号
US19470721636
申请日期
1947.01.11
申请人
HARTFORD NATIONAL BANK AND TRUST COMPANY
发明人
BOER JAN DE;SCHENKEL GERRIT
分类号
H04R1/22;H04R9/00;H04R9/02
主分类号
H04R1/22
代理机构
代理人
主权项
地址
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