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
CA723763A
Inventor
Richardson Philip
H. L. Ritz Hugo
O. Engel Manfred
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.)
CA Parsons and Co Ltd
Original Assignee
CA Parsons and Co Ltd
Publication date
Application grantedgrantedCritical
Publication of CA723763ApublicationCriticalpatent/CA723763A/en