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发明名称
Pen rule
摘要
申请公布号
US2508372(A)
申请公布日期
1950.05.23
申请号
US19450607361
申请日期
1945.07.27
申请人
CARLSON WILLIAM I
发明人
CARLSON WILLIAM I.
分类号
B43K29/08;G01B3/10
主分类号
B43K29/08
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代理人
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