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发明名称
Changeable exhibitor
摘要
申请公布号
US1971455(A)
申请公布日期
1934.08.28
申请号
US19330659885
申请日期
1933.03.06
申请人
MALMBERG CONSTANTINE F
发明人
MALMBERG CONSTANTINE F.
分类号
G09F11/34
主分类号
G09F11/34
代理机构
代理人
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