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发明名称
Mechanical pencil
摘要
申请公布号
US1779854(A)
申请公布日期
1930.10.28
申请号
US19260110626
申请日期
1926.05.21
申请人
PIATT LAURENCE C
发明人
PIATT LAURENCE C.
分类号
B43K21/00
主分类号
B43K21/00
代理机构
代理人
主权项
地址
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