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摘要
申请公布号
US2126496(A)
申请公布日期
1938.08.09
申请号
US19380189584
申请日期
1938.02.09
申请人
PADGETT WALTER C
发明人
PADGETT WALTER C.
分类号
G04C23/16
主分类号
G04C23/16
代理机构
代理人
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