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发明名称
Concrete placer
摘要
申请公布号
US2238051(A)
申请公布日期
1941.04.15
申请号
US19390297836
申请日期
1939.10.04
申请人
HACKLEY ROY C
发明人
HACKLEY ROY C.
分类号
E21D11/10
主分类号
E21D11/10
代理机构
代理人
主权项
地址
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