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发明名称
Mechanical pencil
摘要
申请公布号
US2502773(A)
申请公布日期
1950.04.04
申请号
US19460673107
申请日期
1946.05.29
申请人
BENJAMIN ZELENITZ
发明人
ZELENITZ BENJAMIN
分类号
B23K9/12;B43K21/00;B43K27/04
主分类号
B23K9/12
代理机构
代理人
主权项
地址
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