Do you know anything about the invention of the bar code(条形码)?
A small food store owner found it was 1 to keep records of the product information. In 1948, A head(负责人) asked the Drexel Institute of Technology to solve this 2 . Bernard Silver, a graduate student, was 3 . He and his friend Norman Joseph Woodland 4 to work on it. 5 they invented their first working system. In 1952, the system got the patent(专利).
