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发明名称
COAL PROTECTING METHOD
摘要
申请公布号
CA399298(A)
申请公布日期
1941.09.16
申请号
CAD399298
申请日期
申请人
GEORGE M. WATTLES
发明人
GEORGE M. WATTLES
分类号
主分类号
代理机构
代理人
主权项
地址
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