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经营范围
发明名称
Disintegrating and gathering chain structure
摘要
申请公布号
US2650813(A)
申请公布日期
1953.09.01
申请号
US19490108938
申请日期
1949.08.06
申请人
JOY MANUFACTURING COMPANY
发明人
ROLLINS LESTER G.;BARRETT ARTHUR LEE
分类号
E21C27/26
主分类号
E21C27/26
代理机构
代理人
主权项
地址
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