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发明名称
Vacuum countergravity casting apparatus and method with backflow valve
摘要
申请公布号
US4862945(A)
申请公布日期
1989.09.05
申请号
US19880238203
申请日期
1988.08.30
申请人
GENERAL MOTORS CORPORATION
发明人
GREANIAS, ANTHONY C.;MERCER, JAMES B.
分类号
B22C9/08;B22D18/06
主分类号
B22C9/08
代理机构
代理人
主权项
地址
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