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
CA637360A
Inventor
R. Bennett 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.)
RW Crabtree and Sons Ltd
Original Assignee
RW Crabtree and Sons Ltd
Publication date
Application grantedgrantedCritical
Publication of CA637360ApublicationCriticalpatent/CA637360A/en