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
CA916894A
Inventor
Ono Koichi
Matumoto Futomi
Ise Hidehiro
Yonei Yutaka
Wada Masatoshi
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.)
Nittetsu Mining Co Ltd
Original Assignee
Nittetsu Mining Co Ltd
Publication date
Application grantedgrantedCritical
Publication of CA916894ApublicationCriticalpatent/CA916894A/en