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经营范围
发明名称
Production of smoke signs in the air
摘要
申请公布号
US2674820(A)
申请公布日期
1954.04.13
申请号
US19490134816
申请日期
1949.12.23
申请人
KROHN HANSEN ROLF;SIDNEY PIKE SELE
发明人
HANSEN ROLF KROHN;PIKE SELE SIDNEY
分类号
G09F21/16
主分类号
G09F21/16
代理机构
代理人
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