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
CA727934A
Inventor
E. Roper Ralph
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.)
Wallace Expanding Machines Inc
Original Assignee
Wallace Expanding Machines Inc
Publication date
Application grantedgrantedCritical
Publication of CA727934ApublicationCriticalpatent/CA727934A/en