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发明名称
Planning boards
摘要
申请公布号
US2822632(A)
申请公布日期
1958.02.11
申请号
US19550544474
申请日期
1955.11.02
申请人
PARKER THEODORE B;WILLARD ROBERT G
发明人
PARKER THEODORE B.;WILLARD ROBERT G.
分类号
G09B29/00
主分类号
G09B29/00
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代理人
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