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发明名称
ACOUSTIC SIGNALLING DEVICE
摘要
申请公布号
CA299761(A)
申请公布日期
1930.04.29
申请号
CAD299761
申请日期
申请人
THE BOYMOTO COMPANY;THE MOTO METER GAUGE AND EQUIPMENT CORPORATION;THE M AND H MFG. CO.
发明人
RALPH O. HOOD
分类号
主分类号
代理机构
代理人
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