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发明名称
Mask structure
摘要
申请公布号
US2433088(A)
申请公布日期
1947.12.23
申请号
US19430495966
申请日期
1943.07.22
申请人
BULBULIAN ARTHUR H
发明人
BULBULIAN ARTHUR H.
分类号
A62B18/02
主分类号
A62B18/02
代理机构
代理人
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