what is the first product that was undergone through "Bar Coding"?

what is the first product that was undergone through “Bar Coding”?

Best answer:

It doesn’t say a specific product but rather a trial at a store:

In July 1972 RCA began an eighteen-month test of their system in a Kroger store in Cincinnati. Barcodes were printed on small pieces of adhesive paper, and attached by hand by store employees when they were adding price tags. The code proved to have a serious problem. During printing, presses sometimes smear ink in the direction the paper is running; with the bullseye code this rendered the code unreadable in most orientations. A linear code – like the one being developed by Woodland at IBM – was printed in the direction of the stripes, so extra ink simply makes the code “taller”, and it remains readable.

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