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发明名称
Manufacture of nonmetallic electrical resistance materials
摘要
申请公布号
US2340506(A)
申请公布日期
1944.02.01
申请号
US19400351556
申请日期
1940.08.05
申请人
KARL BIEFELD
发明人
BIEFELD KARL
分类号
C04B33/13;H01C17/065
主分类号
C04B33/13
代理机构
代理人
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