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发明名称
Cathead drum
摘要
申请公布号
US2234811(A)
申请公布日期
1941.03.11
申请号
US19370152727
申请日期
1937.07.09
申请人
SMITH BERNICE B
发明人
SMITH BERNICE B.
分类号
B66D1/74;E21B19/02
主分类号
B66D1/74
代理机构
代理人
主权项
地址
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