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发明名称
Process of producing sound records
摘要
申请公布号
US2231836(A)
申请公布日期
1941.02.11
申请号
US19380184498
申请日期
1938.01.11
申请人
I. G. FARBENINDUSTRIE AKTIENGESELLSCHAFT
发明人
ZERWECK WERNER;KELLER KARL;PINTEN PETER
分类号
G11B3/70
主分类号
G11B3/70
代理机构
代理人
主权项
地址
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