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经营范围
发明名称
Viewing visor
摘要
申请公布号
US2423539(A)
申请公布日期
1947.07.08
申请号
US19450589113
申请日期
1945.04.19
申请人
POLAROID CORPORATION
发明人
WILLIAMS CHARLES W.
分类号
G02C7/10;G02C7/16
主分类号
G02C7/10
代理机构
代理人
主权项
地址
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