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
CA716857A
Inventor
R. Crooks William
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.)
Cooper Bessemer SA
Original Assignee
William R Crooks
Cooper Bessemer SA
Publication date
Application grantedgrantedCritical
Publication of CA716857ApublicationCriticalpatent/CA716857A/en