Network security firewalls and gateways

Utility knives for opening plastic wrapping around CD and DVD cases

Lightbulbs; Aquarium heaters; Electric night lights; Fluorescent lamps; Hair dryers; Sun lamps

Postal services, namely, presorting, stuffing, sealing, postage metering, bundling, and delivering mail to post office

computer hardware and software for use in controlling the operations of computer peripheral devices, such as printers, facsimiles, copiers, scanners and multifunctional devices combining two or more of the functions of such devices; and instructional manuals sold as a unit