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
CA862019A
Inventor
Werner Fritsch
Anton Duennewald
Hans Ribken
Friedrich W. Kruppert
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.)
MANNESMANN TUBE Co Ltd
Original Assignee
MANNESMANN TUBE Co Ltd
Publication date
Application grantedgrantedCritical
Publication of CA862019ApublicationCriticalpatent/CA862019A/en