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摘要
申请公布号
US2487245(A)
申请公布日期
1949.11.08
申请号
US19470728846
申请日期
1947.02.15
申请人
HUBBARD RICHARD T
发明人
HUBBARD RICHARD T.
分类号
G01C9/28
主分类号
G01C9/28
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