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
CA912753A
Inventor
A. Webb Frank
J. Shorter John
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.)
Chas A Blatchford and Sons Ltd
Original Assignee
Chas A Blatchford and Sons Ltd
Publication date
Application grantedgrantedCritical
Publication of CA912753ApublicationCriticalpatent/CA912753A/en