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
CA717286A
Inventor
H. Hopkins Harold
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.)
W Watson and Sons Ltd
Original Assignee
W Watson and Sons Ltd
Publication date
Application grantedgrantedCritical
Publication of CA717286ApublicationCriticalpatent/CA717286A/en