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发明名称
Optical appliance
摘要
申请公布号
US1970958(A)
申请公布日期
1934.08.21
申请号
US19300488850
申请日期
1930.10.15
申请人
ERNST VICTOR C;ANDREW WOLLENSAK
发明人
ERNST VICTOR C.;WOLLENSAK ANDREW
分类号
G11B7/00
主分类号
G11B7/00
代理机构
代理人
主权项
地址
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