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
Inventor
E. Northcutt Walter
H. Klein Charles
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.)
National Telephone Supply Co
Original Assignee
Walter E Northcutt
National Telephone Supply Co
Publication date
Application grantedgrantedCritical
Publication of CA597497ApublicationCriticalpatent/CA597497A/en