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发明名称
Scraper
摘要
申请公布号
US1900189(A)
申请公布日期
1933.03.07
申请号
US19310559841
申请日期
1931.08.28
申请人
MCGHEE ROBERT J
发明人
MCGHEE ROBERT J.
分类号
E21F13/06
主分类号
E21F13/06
代理机构
代理人
主权项
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