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发明名称
COMBUSTIBLE GAS INDICATOR
摘要
申请公布号
CA409821(A)
申请公布日期
1943.01.05
申请号
CAD409821
申请日期
申请人
MINE SAFETY APPLIANCES COMPANY
发明人
RALPH E. HARTLINE
分类号
主分类号
代理机构
代理人
主权项
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