    tence 1: Only. after..a common  mnvention for “bar. ~ codes: had - bee!  stabtished and. in-use for several yea'  lid retailers turn. to” such. systems t  ‘ansmit and recéive data from ‘suppliers,    tence ‘2: These « systems. allowed’  retailers ‘to. receive ‘new. deliveries .mor  jwickly.