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
CA724253A
Inventor
E. Worthington John
S. Woodhead James
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.)
Polygram Casting Co Ltd
Original Assignee
Polygram Casting Co Ltd
Publication date
Application grantedgrantedCritical
Publication of CA724253ApublicationCriticalpatent/CA724253A/en