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发明名称
Apparatus and method for utilizing vacuum in molding plastic material, such as concrete
摘要
申请公布号
US2524419(A)
申请公布日期
1950.10.03
申请号
US19460651352
申请日期
1946.03.01
申请人
VACUUM CONCRETE INC.
发明人
BILLNER KARL P.
分类号
B28B7/46
主分类号
B28B7/46
代理机构
代理人
主权项
地址
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