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
CA767580A
Inventor
R. Macpherson Arthur
J. Last Anthony
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.)
DOMINION STEEL AND COAL Corp
Original Assignee
DOMINION STEEL AND COAL Corp
Publication date
Application grantedgrantedCritical
Publication of CA767580ApublicationCriticalpatent/CA767580A/en