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
CA671942A
Inventor
Willison Donald
J. Wyrough David
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 Castings Co
Original Assignee
National Castings Co
Publication date
Application grantedgrantedCritical
Publication of CA671942ApublicationCriticalpatent/CA671942A/en