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发明名称
Stone-channeling machine
摘要
申请公布号
US1980135(A)
申请公布日期
1934.11.06
申请号
US19310583717
申请日期
1931.12.29
申请人
ALICE HELLSTROM
发明人
HELLSTROM ALICE
分类号
E21C25/62
主分类号
E21C25/62
代理机构
代理人
主权项
地址
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