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发明名称
Mechanical pencil with step-by-step feed
摘要
申请公布号
US2448356(A)
申请公布日期
1948.08.31
申请号
US19450580958
申请日期
1945.03.05
申请人
CLEVELAND SAMUEL M
发明人
CLEVELAND SAMUEL M.
分类号
B43K21/16
主分类号
B43K21/16
代理机构
代理人
主权项
地址
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