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经营范围
发明名称
Improvements in or connected with cutter-chain machines for use in mining coal and other minerals
摘要
申请公布号
GB529967(A)
申请公布日期
1940.12.02
申请号
GB19390017361
申请日期
1939.06.14
申请人
MAVOP AND COULSON, LIMITED;JOHN CONNEL SPROUL
发明人
分类号
E21C25/50
主分类号
E21C25/50
代理机构
代理人
主权项
地址
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