-
公开(公告)号：US2127504A
公开(公告)日：1938-08-23
申请号：US5512635
申请日：1935-12-18
Applicant: ALUMINUM CO OF AMERICA
Inventor： DERR RALPH B , STERE HENRY B
IPC: C01F7/66
CPC classification number: C01F7/66
Search Results
1
records
(took 0.012 seconds)
筛选
AND
AND
过滤
NOT
NOT
Scan to Join
