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经营范围
发明名称
Speech amplifying and reproducing system
摘要
申请公布号
US1755484(A)
申请公布日期
1930.04.22
申请号
US19270206341
申请日期
1927.07.16
申请人
ROY MARK LE
发明人
MARK LE ROY
分类号
H04R1/40;H04R3/00
主分类号
H04R1/40
代理机构
代理人
主权项
地址
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