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摘要
申请公布号
US1976430(A)
申请公布日期
1934.10.09
申请号
US19320648102
申请日期
1932.12.20
申请人
BERG CHARLES E
发明人
BERG CHARLES E.
分类号
A47L13/512
主分类号
A47L13/512
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