Grumpy Old Geeks Topics Universal Product Code Topic Universal Product Code 3 mentions in 1 episode The hosts discuss the UPC barcode’s first retail scan and interpretations of its guard bars. Mentions 401: What’s Her Nuts? Dec 18, 2019 53:26 the rectangular universal product code, the UPC 53:42 The UPC made its official debut in 1974 54:00 the so-called three guard bars at the beginning and in middle of the code resemble the numeral 6