A bar code printer is disclosed which may be used as a standard desk type bar code printer, a weighing bar code printer, etc. by connecting outer peripheral equipment, such as weighing instruments or price indicating balances, to the bar code printer. A change-over circuit can select an input signal...http://www.google.es/patents/US4630067?utm_source=gb-gplus-sharePatente US4630067 - Bar code printer
