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发明名称
Apparatus for map display and preservation
摘要
申请公布号
US1823996(A)
申请公布日期
1931.09.22
申请号
US19270224651
申请日期
1927.10.07
申请人
A.J. NYSTROM & CO.
发明人
SWANSON FRANK H.
分类号
A47B97/02
主分类号
A47B97/02
代理机构
代理人
主权项
地址
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