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发明名称
Hoist drum control
摘要
申请公布号
US2620909(A)
申请公布日期
1952.12.09
申请号
US19470786462
申请日期
1947.11.17
申请人
WESTERN OIL TOOL & ENGINEERING CO. INC.
发明人
MOON JAMES
分类号
B66D1/14
主分类号
B66D1/14
代理机构
代理人
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地址
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