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摘要
申请公布号
US2593475(A)
申请公布日期
1952.04.22
申请号
US19480014967
申请日期
1948.03.15
申请人
SPEED PRODUCTS COMPANY, INC.
发明人
NEILSEN HILDAUR L.
分类号
B42F17/34;H04M1/21
主分类号
B42F17/34
代理机构
代理人
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