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
CA617164A
Inventor
Willison Donald
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 Malleable and Steel Castings Co
Original Assignee
National Malleable and Steel Castings Co
Publication date
Application grantedgrantedCritical
Publication of CA617164ApublicationCriticalpatent/CA617164A/en