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
CA718997A
Inventor
A. Butcher Raymond
H. H. Davis John
Exwood Maurice
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.)
R&R Research Ltd
Original Assignee
R&R Research Ltd
Publication date
Application grantedgrantedCritical
Publication of CA718997ApublicationCriticalpatent/CA718997A/en