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发明名称
Reduction of yellowing of materials with age
摘要
申请公布号
US1814344(A)
申请公布日期
1931.07.14
申请号
US19300443617
申请日期
1930.04.11
申请人
SNELLING WALTER O
发明人
SNELLING WALTER O.
分类号
D21H21/28
主分类号
D21H21/28
代理机构
代理人
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