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
CA854873A
Inventor
Ronald B. Hosking
Lionel V. Dufresne
Original Assignee
Bell Telephone Company of Canada
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bell Telephone Company of CanadafiledCriticalBell Telephone Company of Canada
Application grantedgrantedCritical
Publication of CA854873ApublicationCriticalpatent/CA854873A/en