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经营范围
发明名称
Traveling block
摘要
申请公布号
US3353794(A)
申请公布日期
1967.11.21
申请号
US19660570559
申请日期
1966.08.05
申请人
BYRON JACKSON, INC.
发明人
JR. ROGER SMITH,
分类号
B66D3/04;B66D3/06;E21B19/02
主分类号
B66D3/04
代理机构
代理人
主权项
地址
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