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发明名称
Grating
摘要
申请公布号
US2333510(A)
申请公布日期
1943.11.02
申请号
US19400358598
申请日期
1940.09.27
申请人
WALTER EDWARD IRVING
发明人
BARRY RICHARD J.;RASMUSSEN CARL
分类号
E04C2/42
主分类号
E04C2/42
代理机构
代理人
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