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
CA616951A
Inventor
Hale Andrew
A. Mcclellan Boyd
L. Guggenheim Robert
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.)
Blaw Knox Co
Original Assignee
Blaw Knox Co
Publication date
Application grantedgrantedCritical
Publication of CA616951ApublicationCriticalpatent/CA616951A/en