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
CA685522A
Inventor
D. Harper John
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.)
POWERED PIPE
Original Assignee
POWERED PIPE
Publication date
Application grantedgrantedCritical
Publication of CA685522ApublicationCriticalpatent/CA685522A/en