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摘要
申请公布号
US1955573(A)
申请公布日期
1934.04.17
申请号
US19310558309
申请日期
1931.08.20
申请人
DEMPSTER BEATTY
发明人
BEATTY DEMPSTER
分类号
B42F21/00
主分类号
B42F21/00
代理机构
代理人
主权项
地址
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