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发明名称
SPEAKER SYSTEM FOR WELDERS' HELMETS AND THE LIKE
摘要
申请公布号
US3549831(A)
申请公布日期
1970.12.22
申请号
USD3549831
申请日期
1968.02.21
申请人
FORNEY IND. INC.
发明人
JACK D. FORNEY
分类号
H04M1/05;H04M1/62;(IPC1-7):H04M1/05
主分类号
H04M1/05
代理机构
代理人
主权项
地址
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