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发明名称
Heat retarding device and method of making the same
摘要
申请公布号
US2269494(A)
申请公布日期
1942.01.13
申请号
US19380247718
申请日期
1938.12.24
申请人
AMERICAN OPTICAL COMPANY
发明人
TILLYER EDGAR D.
分类号
C03C3/17;C03C4/08;G03B21/16;G03B21/18
主分类号
C03C3/17
代理机构
代理人
主权项
地址
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