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
CA643783A
Inventor
B. Relph Earl
A. Dahl Henry
Christiansen 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.)
AB Dick Co
Original Assignee
AB Dick Co
Publication date
Application grantedgrantedCritical
Publication of CA643783ApublicationCriticalpatent/CA643783A/en