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发明名称
Improvements in or relating to poppet valves for internal combustion engines
摘要
申请公布号
GB371152(A)
申请公布日期
1932.04.21
申请号
GB19310010278
申请日期
1931.04.07
申请人
FREDERICK COOLIDGE CRAWFORD
发明人
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主分类号
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