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
CA896445A
Inventor
J. Pickard Keith
V. Whittam Thomas
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.)
Peter Spence and Sons Ltd
Original Assignee
Peter Spence and Sons Ltd
Publication date
Application grantedgrantedCritical
Publication of CA896445ApublicationCriticalpatent/CA896445A/en