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
CA712559A
Inventor
W. Bradley James
F. Borth Paul
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.)
PHOTO-ENGRAVERS RESEARCH
Original Assignee
PHOTO-ENGRAVERS RESEARCH
Publication date
Application grantedgrantedCritical
Publication of CA712559ApublicationCriticalpatent/CA712559A/en