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
CA704009A
Inventor
G. Helmerson Bengt
A. Johansson Fritz
F. Norro Allan
V. Mokvist Nils
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.)
Bolidens Gruvaktiebolag
Original Assignee
Bolidens Gruvaktiebolag
Publication date
Application grantedgrantedCritical
Publication of CA704009ApublicationCriticalpatent/CA704009A/en