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
CA679868A
Inventor
A. Henderson Kenneth
J. Arrey Kelly
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.)
Canadian National Railway Co
Original Assignee
Canadian National Railway Co
Publication date
Application grantedgrantedCritical
Publication of CA679868ApublicationCriticalpatent/CA679868A/en