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发明名称
Indicating means
摘要
申请公布号
US1805244(A)
申请公布日期
1931.05.12
申请号
US19270221872
申请日期
1927.09.26
申请人
HAROLD E. HAWKINS
发明人
HAWKINS ROSS
分类号
B42F17/00
主分类号
B42F17/00
代理机构
代理人
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