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发明名称
Mechanical pencil
摘要
申请公布号
US2216780(A)
申请公布日期
1940.10.08
申请号
US19370175337
申请日期
1937.11.18
申请人
THE ESTERBROOK STEEL PEN MANUFACTURING CO.
发明人
KLAGGES HENRY C.
分类号
B43K21/20;B43K21/22
主分类号
B43K21/20
代理机构
代理人
主权项
地址
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