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
CA729890A
Inventor
E. Myard Francis
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.)
ETS GRANGIER ET CIE A RESPONSABILITE Ltee Ste
Original Assignee
ETS GRANGIER ET CIE A RESPONSABILITE Ltee Ste
Publication date
Application grantedgrantedCritical
Publication of CA729890ApublicationCriticalpatent/CA729890A/en