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
CA669730A
Inventor
L. Meyer Henry
R. Wilhelm Fred
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.)
Cleveland Trencher Co
Original Assignee
Cleveland Trencher Co
Publication date
Application grantedgrantedCritical
Publication of CA669730ApublicationCriticalpatent/CA669730A/en