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摘要
申请公布号
US1820771(A)
申请公布日期
1931.08.25
申请号
US19300449546
申请日期
1930.05.03
申请人
BERING GEORGE A
发明人
BERING GEORGE A.
分类号
A44B1/28
主分类号
A44B1/28
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