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
CA690052A
Inventor
Keller Gunther
Schmitt Karl
Rindtorff Ermbrecht
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.)
Bergwerksgesellschaft Hibernia AG
Original Assignee
Bergwerksgesellschaft Hibernia AG
Publication date
Application grantedgrantedCritical
Publication of CA690052ApublicationCriticalpatent/CA690052A/en