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
CA803756A
Inventor
W. Loveday Harry
R. Barbour Denis
D. Whittaker Jack
Tweedie William
S. Dryden George
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.)
Greenbank Engineering Co Ltd
Easton and Johnson Ltd
Original Assignee
Greenbank Engineering Co Ltd
Easton and Johnson Ltd
Publication date
Application grantedgrantedCritical
Publication of CA803756ApublicationCriticalpatent/CA803756A/en