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
CA797372A
Inventor
Joseph F. Duffield
Original Assignee
Smith and Stone Ltd
Publication date
Application grantedgrantedCritical
Publication of CA797372ApublicationCriticalpatent/CA797372A/en