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发明名称
Improvement in engine indicator and spark plug
摘要
申请公布号
GB330074(A)
申请公布日期
1930.06.05
申请号
GB19290012418
申请日期
1929.04.22
申请人
GENERAL MOTORS RESEARCH CORPORATION
发明人
分类号
H01T13/40
主分类号
H01T13/40
代理机构
代理人
主权项
地址
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