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发明名称
Improvements in or relating to coal and like cutting machines
摘要
申请公布号
GB353431(A)
申请公布日期
1931.07.22
申请号
GB19300012333
申请日期
1930.04.22
申请人
WILLIAM VERNON;SYDNEY THOMAS
发明人
分类号
E21C35/04
主分类号
E21C35/04
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代理人
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