TDSI

COMPUTERS AND PARTS THEREOF; COMPUTER PROGRAMS FOR SECURITY PURPOSES; ELECTRICAL AND ELECTRONIC APPARATUS, NAMELY, COMPUTERIZED ACCESS CONTROLLERS, CARD READERS, PROGRAMMABLE CONTROL UNITS TO READ CARDS FOR SECURITY PURPOSES, LOCKS AND LOCK ACTUATORS, ELECTRICAL MESSAGE SWITCHES FOR USE IN COMMUNICATIONS, SIGNAL MULTIPLEXERS, MODEMS, VISUAL DISPLAY UNITS, BLANK COMPUTER HARD AND/OR FLOPPY DISCS, BLANK AUDIO AND/OR VIDEO TAPE