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
CA878942A
Inventor
W. Brown Harry
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.)
Longyear Co
Original Assignee
Longyear Co
Publication date
Application grantedgrantedCritical
Publication of CA878942ApublicationCriticalpatent/CA878942A/en