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经营范围
发明名称
Electrically operated whistle
摘要
申请公布号
US1869052(A)
申请公布日期
1932.07.26
申请号
US19290409278
申请日期
1929.11.23
申请人
DUERS SIGNAL COMPANY, INC.
发明人
DUERS CLARENCE R.
分类号
G08G1/09
主分类号
G08G1/09
代理机构
代理人
主权项
地址
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