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COMPUTER PROGRAMS FOR USE WITH BAR CODE READERS; BATTERIES; INTERCONNECT CABLES; SIGNAL INTERFACE MODULES AND UNITS; BATTERY CHARGERS AND DISCHARGERS; POWER SUPPLIES; LASER SCANNERS; CONTACT SCANNERS; NON-CONTACT SCANNERS; AND, CONCENTRATORS AND PROTOCOL CONVERTERS FOR PROVIDING BIDIRECTIONAL DATA COMMUNICATIONS BETWEEN A PLURALITY OF BAR CODE READERS AND PRINTERS AND A HOST COMPUTER

PAPER KEYBOARDS CONTAINING BAR CODE SYMBOLS AND PRINTED BOOKLETS DEALING WITH COMPUTER PROGAMS