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发明名称
Traveling block and system
摘要
申请公布号
US1828897(A)
申请公布日期
1931.10.27
申请号
US19290331246
申请日期
1929.01.09
申请人
ERLE P. HALLIBURTON
发明人
HOLLINGSWORTH HOMER J.
分类号
B66D3/04;B66D3/06
主分类号
B66D3/04
代理机构
代理人
主权项
地址
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