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发明名称
Aperture cards
摘要
申请公布号
US3212206(A)
申请公布日期
1965.10.19
申请号
US19620191117
申请日期
1962.04.30
申请人
LANGAN APERTURE CARDS, INC.
发明人
LANGAN JOHN F.;JR. LORIMER CLAYTON,;JR. GRANT E. ALLEN,
分类号
B42F5/00;G03B21/64;G06K19/02
主分类号
B42F5/00
代理机构
代理人
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地址
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