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
CA652492A
Inventor
A. Herpich William
R. Dempster 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.)
Dempster Brothers Inc
Original Assignee
Dempster Brothers Inc
Publication date
Application grantedgrantedCritical
Publication of CA652492ApublicationCriticalpatent/CA652492A/en