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摘要
申请公布号
US1877326(A)
申请公布日期
1932.09.13
申请号
US19300441538
申请日期
1930.04.04
申请人
MARTIN & SCHWARTZ, INC.
发明人
SCHWARTZ RUDOLPH L.;MARTIN WILLIAM PAUL
分类号
G09F3/20
主分类号
G09F3/20
代理机构
代理人
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