Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA911741A
Inventor
Kawai Tadashi
Kenma Hideaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsui Mining and Smelting Co Ltd
Original Assignee
Mitsui Mining and Smelting Co Ltd
Publication date
Application grantedgrantedCritical
Publication of CA911741ApublicationCriticalpatent/CA911741A/en