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
CA711875A
Inventor
M. Upson Maxwell
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.)
Raymond Concrete Pile Co Ltd
Original Assignee
Raymond Concrete Pile Co Ltd
Publication date
Application grantedgrantedCritical
Publication of CA711875ApublicationCriticalpatent/CA711875A/en