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
CA730569A
Inventor
Jerry Karlovsky, Jr.
M. Cookson John
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.)
National Mine Service Co
Original Assignee
National Mine Service Co
Publication date
Application grantedgrantedCritical
Publication of CA730569ApublicationCriticalpatent/CA730569A/en