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发明名称
Method of making concrete pipe
摘要
申请公布号
US2224419(A)
申请公布日期
1940.12.10
申请号
US19390274886
申请日期
1939.05.22
申请人
AMERICAN CONCRETE AND STEEL PIPE COMPANY
发明人
WHITMAN NATHAN D.
分类号
B28B21/58;B28B21/68;B28B21/90
主分类号
B28B21/58
代理机构
代理人
主权项
地址
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