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发明名称
Hollow casing speae
摘要
申请公布号
US1805535(A)
申请公布日期
1931.05.19
申请号
US19300463162
申请日期
1930.06.29
申请人
VREELAND WILLIAM H
发明人
VREELAND WILLIAM H.
分类号
E21B31/20;E21B43/10
主分类号
E21B31/20
代理机构
代理人
主权项
地址
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