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经营范围
发明名称
Variable density window
摘要
申请公布号
US2255933(A)
申请公布日期
1941.09.16
申请号
US19400369763
申请日期
1940.12.12
申请人
POLAROID CORPORATION
发明人
LAND EDWIN H.
分类号
G02B27/28
主分类号
G02B27/28
代理机构
代理人
主权项
地址
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