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
CA845478A
Inventor
A. Pitts William
L. Crain Robert
Elwood K. Pierce, Jr.
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.)
Vetco Gray LLC
Original Assignee
Gray Tool Co
Publication date
Application grantedgrantedCritical
Publication of CA845478ApublicationCriticalpatent/CA845478A/en