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
CA725929A
Inventor
Freeman Edward
Greene Bert
Firestein Harry
Tyas 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.)
LOUIS HAND
Original Assignee
LOUIS HAND
Publication date
Application grantedgrantedCritical
Publication of CA725929ApublicationCriticalpatent/CA725929A/en