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
CA883001A
Inventor
Knoll Hans
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.)
Tiefbohr-Technik And Co GmbH
Original Assignee
Tiefbohr-Technik And Co GmbH
Publication date
Application grantedgrantedCritical
Publication of CA883001ApublicationCriticalpatent/CA883001A/en