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摘要
申请公布号
US2248703(A)
申请公布日期
1941.07.08
申请号
US19400315639
申请日期
1940.01.26
申请人
JOSEPH FRIEDMAN
发明人
FRIEDMAN JOSEPH
分类号
B42F21/00
主分类号
B42F21/00
代理机构
代理人
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