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发明名称
Sign
摘要
申请公布号
US1994519(A)
申请公布日期
1935.03.19
申请号
US19300489624
申请日期
1930.10.18
申请人
ALBERT F. SPITZGLASS
发明人
JAMES GEORGE SAMUEL
分类号
F21V8/00;G02B6/00;G09F13/18
主分类号
F21V8/00
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