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
CA656896A
Inventor
J. Prest Robert
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.)
Technical Operations Inc
Original Assignee
Technical Operations Inc
Publication date
Application grantedgrantedCritical
Publication of CA656896ApublicationCriticalpatent/CA656896A/en