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发明名称
Improvements in gummers for use in conjunction with coal mining machines
摘要
申请公布号
GB635395(A)
申请公布日期
1950.04.05
申请号
GB19480007441
申请日期
1948.03.11
申请人
ALEXANDER ANDERSON;ANDERSON, BOYES & COMPANY LIMITED
发明人
分类号
E21C35/20
主分类号
E21C35/20
代理机构
代理人
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