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发明名称
Propeller
摘要
申请公布号
US2151939(A)
申请公布日期
1939.03.28
申请号
US19380211014
申请日期
1938.05.31
申请人
W. W. KEITH
发明人
RICHARDSON CECIL S.
分类号
B63H1/12
主分类号
B63H1/12
代理机构
代理人
主权项
地址
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