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发明名称
Safety collar
摘要
申请公布号
US2864148(A)
申请公布日期
1958.12.16
申请号
US19570636575
申请日期
1957.01.28
申请人
JERSEY PRODUCTION RESEARCH COMPANY
发明人
WAIT HAROLD V.
分类号
E21D15/30
主分类号
E21D15/30
代理机构
代理人
主权项
地址
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