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摘要
申请公布号
US1772172(A)
申请公布日期
1930.08.05
申请号
US19290390303
申请日期
1929.09.04
申请人
WILDE GEORGE F
发明人
WILDE GEORGE F.
分类号
B04B3/04
主分类号
B04B3/04
代理机构
代理人
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