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发明名称
Proportional mask
摘要
申请公布号
US1976278(A)
申请公布日期
1934.10.09
申请号
US19280284778
申请日期
1928.06.12
申请人
COCK ROBERT C
发明人
COCK ROBERT C.
分类号
B43L13/00;G03B27/58
主分类号
B43L13/00
代理机构
代理人
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