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发明名称
Observation device
摘要
申请公布号
US1957378(A)
申请公布日期
1934.05.01
申请号
US19330680873
申请日期
1933.07.17
申请人
ALLIED MANUFACTURING COMPANY
发明人
ZIMMERMAN HARRY
分类号
G03B23/12
主分类号
G03B23/12
代理机构
代理人
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