On April 3, 1973 the barcode was invented by Bernard Siver and Norman Josef Woodland.
Nowadays the barcode is a kind of key giving information about a product both to professionals and ordinary people.
In 1948 a student in the city of Philadelphia Bernard Silver developed product labelling which was put with the help of glowing ink. However, the first sample was not reliable and extremely expensive and Silver decided to improve it.
Some months later, he, together with his friend Norman Josef Woodland, invented a linear barcode and then friends patented their invention.
Unlike modern ones, first barcodes were circular.
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