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发明名称
Arc carbon
摘要
申请公布号
US1920921(A)
申请公布日期
1933.08.01
申请号
US19280250069
申请日期
1928.01.27
申请人
NATIONAL CARBON COMPANY, INC.
发明人
DORCAS MERRILL J.
分类号
H05B31/06
主分类号
H05B31/06
代理机构
代理人
主权项
地址
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