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发明名称
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摘要
申请公布号
US1840173(A)
申请公布日期
1932.01.05
申请号
US19290344904
申请日期
1929.03.06
申请人
RAY WILLIAM J
发明人
RAY WILLIAM J.
分类号
C04B2/08
主分类号
C04B2/08
代理机构
代理人
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