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发明名称
Ballast working implement
摘要
申请公布号
US2690135(A)
申请公布日期
1954.09.28
申请号
US19490119936
申请日期
1949.10.06
申请人
JACKSON VIBRATORS, INC.
发明人
JACKSON CORWILL
分类号
E01B27/14
主分类号
E01B27/14
代理机构
代理人
主权项
地址
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