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发明名称
Helicopter construction
摘要
申请公布号
US2497040(A)
申请公布日期
1950.02.07
申请号
US19470742491
申请日期
1947.04.19
申请人
WILLIAMS SAMUEL B
发明人
WILLIAMS SAMUEL B.
分类号
B64C27/10
主分类号
B64C27/10
代理机构
代理人
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