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经营范围
发明名称
The ducted safety propellor (ducsprop)
摘要
申请公布号
GB9917911(D0)
申请公布日期
1999.09.29
申请号
GB19990017911
申请日期
1999.07.31
申请人
PURT, MICHAEL B D
发明人
分类号
B63H1/16
主分类号
B63H1/16
代理机构
代理人
主权项
地址
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