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发明名称
Method for roasting pencil leads
摘要
申请公布号
US2140825(A)
申请公布日期
1938.12.20
申请号
US19370147061
申请日期
1937.06.08
申请人
THE FIRM "KOH-I-NOOR" TUZKARNA L. & C. HARDTMUTH
发明人
ZUCKERT RICHARD
分类号
B43K19/18
主分类号
B43K19/18
代理机构
代理人
主权项
地址
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