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发明名称
Signpost support
摘要
申请公布号
US1799314(A)
申请公布日期
1931.04.07
申请号
US19290343274
申请日期
1929.02.28
申请人
PFAFF AND KENDALL
发明人
PFAFF HENRY C.
分类号
E01F9/011;E04H12/22
主分类号
E01F9/011
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