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发明名称
Free piston
摘要
申请公布号
US2937598(A)
申请公布日期
1960.05.24
申请号
US19560620533
申请日期
1956.11.05
申请人
U. S. INDUSTRIES, INC.
发明人
BROWN NORMAN FRASER
分类号
E21B37/04;E21B43/12
主分类号
E21B37/04
代理机构
代理人
主权项
地址
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