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摘要
申请公布号
US1996983(A)
申请公布日期
1935.04.09
申请号
US19340729093
申请日期
1934.06.05
申请人
A. D. STEINBACH & SONS, INC.
发明人
STEINBACH BERNARD A.
分类号
G09F1/04
主分类号
G09F1/04
代理机构
代理人
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