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发明名称
Method of making graphite pencil leads and similar articles
摘要
申请公布号
US2388447(A)
申请公布日期
1945.11.06
申请号
US19420432456
申请日期
1942.02.26
申请人
STRAIGHT HALVER R
发明人
STRAIGHT HALVER R.
分类号
B43K19/18;C04B35/52;C09D13/00
主分类号
B43K19/18
代理机构
代理人
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