What is the origin of Wei Long biscuit bar code?

Norman woodland and Bernard Silver obtained the initial bar code patents. The bar code of Wei Long biscuit is a kind of commodity bar code, and its history can be traced back to 1952. At that time, norman woodland and Bernard Silver, students of the Department of Technology of drexel University in Philadelphia, USA, obtained the original bar code patent. At that time, the bar code was different from the contemporary one, not composed of lines, but composed of a group of concentric circles, which was read by a photo scanner.