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
CA641232A
Inventor
A. Fuller Raymond
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.)
Davey Paxman and Co Ltd
Ultra Electric Ltd
Original Assignee
Davey Paxman and Co Ltd
Ultra Electric Ltd
Publication date
Application grantedgrantedCritical
Publication of CA641232ApublicationCriticalpatent/CA641232A/en