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发明名称
Ramp structure
摘要
申请公布号
US1753115(A)
申请公布日期
1930.04.01
申请号
US19280259065
申请日期
1928.03.05
申请人
GOODRICH WILLIAM F
发明人
GOODRICH WILLIAM F.
分类号
E04H6/10
主分类号
E04H6/10
代理机构
代理人
主权项
地址
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