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
CA732356A
Inventor
Bennett Jack
J. Richards Bernard
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.)
EN Mason and Sons Ltd
Original Assignee
Bernard J Richards
EN Mason and Sons Ltd
Publication date
Application grantedgrantedCritical
Publication of CA732356ApublicationCriticalpatent/CA732356A/en