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经营范围
发明名称
EXPLOSION-PROOF ACOUSTIC DEVICE
摘要
申请公布号
US3497638(A)
申请公布日期
1970.02.24
申请号
USD3497638
申请日期
1967.03.20
申请人
LTV LING ALTEC INC.
发明人
ABRAHAM B. COHEN
分类号
H04R11/02;(IPC1-7):H04R7/02;H04R1/28
主分类号
H04R11/02
代理机构
代理人
主权项
地址
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