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摘要
申请公布号
US1913578(A)
申请公布日期
1933.06.13
申请号
US19310536730
申请日期
1931.05.12
申请人
THE UNION SWITCH & SIGNAL COMPANY
发明人
WITMER HAROLD G.
分类号
F21V9/08;G08B5/38
主分类号
F21V9/08
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