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
CA648787A
Inventor
L. Hayes Harold
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.)
Barber Colman Co
Original Assignee
Barber Colman Co
Publication date
Application grantedgrantedCritical
Publication of CA648787ApublicationCriticalpatent/CA648787A/en