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
CA863680A
Inventor
R. Powell Edgar
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.)
DW Zimmerman Manufacturing Inc
Original Assignee
DW Zimmerman Manufacturing Inc
Publication date
Application grantedgrantedCritical
Publication of CA863680ApublicationCriticalpatent/CA863680A/en