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发明名称
Safety pencil holder
摘要
申请公布号
US1996664(A)
申请公布日期
1935.04.02
申请号
US19330682604
申请日期
1933.07.28
申请人
CHARLES WALKER
发明人
WALKER CHARLES
分类号
B43K23/00
主分类号
B43K23/00
代理机构
代理人
主权项
地址
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