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发明名称
Scraper
摘要
申请公布号
US2025285(A)
申请公布日期
1935.12.24
申请号
US19350007146
申请日期
1935.02.18
申请人
HUNTER DELBERT N;BUTTS MAURICE J
发明人
HUNTER DELBERT N.;BUTTS MAURICE J.
分类号
E02F3/64
主分类号
E02F3/64
代理机构
代理人
主权项
地址
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Signalling marker
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