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发明名称
Pencil lead
摘要
申请公布号
US2355639(A)
申请公布日期
1944.08.15
申请号
US19430487654
申请日期
1943.05.19
申请人
M. A. FERST, LTD.
发明人
FERST MONIE A.;WYSONG CHARLES F.
分类号
C09D13/00
主分类号
C09D13/00
代理机构
代理人
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