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
CA672748A
Inventor
A. Arp Ewald
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.)
ARNOLD W LARSON
Original Assignee
ARNOLD W LARSON
Publication date
Application grantedgrantedCritical
Publication of CA672748ApublicationCriticalpatent/CA672748A/en