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
CA640362A
Inventor
E. Norton Douglas
Norton Henry
B. Norton Leslie
V. Norton Hubert
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.)
Norton Tool Co Ltd
Original Assignee
Norton Tool Co Ltd
Publication date
Application grantedgrantedCritical
Publication of CA640362ApublicationCriticalpatent/CA640362A/en