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发明名称
Protective device
摘要
申请公布号
US1821677(A)
申请公布日期
1931.09.01
申请号
US19280275343
申请日期
1928.05.05
申请人
INGERSOLL-RAND COMPANY
发明人
SMITH WILLIAM A.
分类号
E21B1/30
主分类号
E21B1/30
代理机构
代理人
主权项
地址
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