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发明名称
Cement sack opening device
摘要
申请公布号
US2078599(A)
申请公布日期
1937.04.27
申请号
US19360085607
申请日期
1936.06.16
申请人
GEORGE L. BLAXTON
发明人
MCCAULEY IRVIN D.
分类号
主分类号
代理机构
代理人
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