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摘要
申请公布号
US1773808(A)
申请公布日期
1930.08.26
申请号
US19220605533
申请日期
1922.12.07
申请人
PATTERSON DAVIS ARTHUR
发明人
DAVIS ARTHUR PATTERSON
分类号
F41G5/16
主分类号
F41G5/16
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