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
CA737668A
Inventor
F. Fairgrieve 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.)
FAIRGRIEVE AND SON
Original Assignee
FAIRGRIEVE AND SON
Publication date
Application grantedgrantedCritical
Publication of CA737668ApublicationCriticalpatent/CA737668A/en