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摘要
申请公布号
US2505116(A)
申请公布日期
1950.04.25
申请号
US19480053408
申请日期
1948.10.08
申请人
HITCHINGS JOHN B
发明人
HITCHINGS JOHN B.
分类号
B42F17/30
主分类号
B42F17/30
代理机构
代理人
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地址
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