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摘要
申请公布号
US3164917(A)
申请公布日期
1965.01.12
申请号
US19620192145
申请日期
1962.05.03
申请人
HARPER RALPH C
发明人
HARPER RALPH C.
分类号
B42F21/08
主分类号
B42F21/08
代理机构
代理人
主权项
地址
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