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
CA649505A
Inventor
W. Meredith Frederick
M. A. Majendie Alastair
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.)
S Smith and Sons England Ltd
Original Assignee
S Smith and Sons England Ltd
Publication date
Application grantedgrantedCritical
Publication of CA649505ApublicationCriticalpatent/CA649505A/en