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
CA721718A
Inventor
W. Vigers Frederick
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.)
VIGERS STEVENS AND ADAMS Ltd
Original Assignee
VIGERS STEVENS AND ADAMS Ltd
Publication date
Application grantedgrantedCritical
Publication of CA721718ApublicationCriticalpatent/CA721718A/en