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
CA799374A
Inventor
J. Boon Derk
F. Hager Karl
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.)
Reeves Brothers Inc
Original Assignee
Derk J Boon
Karl F Hager
Reeves Brothers Inc
Publication date
Application grantedgrantedCritical
Publication of CA799374ApublicationCriticalpatent/CA799374A/en