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发明名称
PERFORATION OF TABULATING CARDS
摘要
申请公布号
US3500435(A)
申请公布日期
1970.03.10
申请号
USD3500435
申请日期
1965.11.02
申请人
RUSCO IND. INC.
发明人
LOUIS M. BALLARD
分类号
G06K1/04;(IPC1-7):G01D15/06
主分类号
G06K1/04
代理机构
代理人
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地址
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