Hi, Canada Post began using (UPC) barcodes for inventory control in 1989 on booklets and 2001 on panes according to Unitrade Specialized Catalogue. I'm wonder if there are collectors on Stamporama of these barcodes on panes?
Also if there are collectors, what information do you have about the the process that CP used to implement this inventory control system?

I used Album Easy (thanks Clive) to create these pages for my collection.

Happy Holidays,
Clarence (Wigalso)