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发明名称
Grating
摘要
申请公布号
US2011730(A)
申请公布日期
1935.08.20
申请号
US19320619974
申请日期
1932.06.29
申请人
RICHMOND HIRAM W;KEMP CHARLES G
发明人
RICHMOND HIRAM W.;KEMP CHARLES G.
分类号
E04C2/42
主分类号
E04C2/42
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代理人
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