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发明名称
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摘要
申请公布号
US1780555(A)
申请公布日期
1930.11.04
申请号
US19300432651
申请日期
1930.03.03
申请人
JOHNSON ERIC G
发明人
JOHNSON ERIC G.
分类号
A44B1/28
主分类号
A44B1/28
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