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
CA787171A
Inventor
E. Huck George
C. Silliman 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.)
American Pipe and Construction Co
Original Assignee
American Pipe and Construction Co
Publication date
Application grantedgrantedCritical
Publication of CA787171ApublicationCriticalpatent/CA787171A/en