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摘要
申请公布号
US2530702(A)
申请公布日期
1950.11.21
申请号
US19470769604
申请日期
1947.08.20
申请人
JOHNSON HOWARD L
发明人
JOHNSON HOWARD L.
分类号
B41J29/15
主分类号
B41J29/15
代理机构
代理人
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