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发明名称
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摘要
申请公布号
US2228864(A)
申请公布日期
1941.01.14
申请号
US19390289853
申请日期
1939.08.12
申请人
DOW, JONES & CO. INC.
发明人
ACKELL JOSEPH J.
分类号
B41B1/00
主分类号
B41B1/00
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