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发明名称
Sign
摘要
申请公布号
US1831532(A)
申请公布日期
1931.11.10
申请号
US19280298479
申请日期
1928.08.09
申请人
ART METAL WORKS, INC.
发明人
HARRIS ALEXANDER
分类号
G09F13/14
主分类号
G09F13/14
代理机构
代理人
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