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发明名称
Peg charts
摘要
申请公布号
US2902776(A)
申请公布日期
1959.09.08
申请号
US19540468509
申请日期
1954.11.12
申请人
MATTHIAS BUTLER ERNEST
发明人
BUTLER ERNEST MATTHIAS
分类号
G09D1/00
主分类号
G09D1/00
代理机构
代理人
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