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
CA719513A
Inventor
Butterworth George
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.)
Acrow Engineers Ltd
Original Assignee
Acrow Engineers Ltd
Publication date
Application grantedgrantedCritical
Publication of CA719513ApublicationCriticalpatent/CA719513A/en