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经营范围
发明名称
Improvements in or relating to a boring and core breaking mechanism for mining
摘要
申请公布号
GB770122(A)
申请公布日期
1957.03.13
申请号
GB19550013860
申请日期
1955.05.13
申请人
JOY MANUFACTURING COMPANY
发明人
BARRETT ARTHUR LEE
分类号
E21C27/12
主分类号
E21C27/12
代理机构
代理人
主权项
地址
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