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发明名称
All-weather recording board
摘要
申请公布号
US2547167(A)
申请公布日期
1951.04.03
申请号
US19490106001
申请日期
1949.07.21
申请人
NIELSEN JOHN P
发明人
NIELSEN JOHN P.
分类号
B43L3/00
主分类号
B43L3/00
代理机构
代理人
主权项
地址
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