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经营范围
发明名称
Pelletized portland cement
摘要
申请公布号
US2221175(A)
申请公布日期
1940.11.12
申请号
US19380185309
申请日期
1938.01.17
申请人
CALIFORNIA PORTLAND CEMENT COMPANY
发明人
BECHTOLD IRA C.
分类号
C04B7/40;C04B7/52;C04B40/06
主分类号
C04B7/40
代理机构
代理人
主权项
地址
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