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Components and apparatus for portable and cellular telephones, pagers, personal communication devices and digital assistants and battery powered electronic devices, namely, seals, sealants and adhesive and insulating sheets for use with batteries and power cells; devices to improve performance, recover power, prevent deterioration and reduce charging time of batteries, rechargeable batteries and power cells, namely, seals and adhesive sheets for application in battery compartments of portable telephones and other battery-powered machines and apparatus, rechargeable batteries; batteries and power cells and parts therefor; rechargeable electric batteries and parts therefor; photographic apparatus, namely, photographic cameras, photo-developing, printing, enlarging or finishing machines, tripods for cameras, slide projectors, self-timers, cases for cameras, camcorders and video cameras; cinematographic apparatus, namely, movie projectors, movie film developing or finishing machines, video screens, projection screens, film editing machines and sound recording machines; optical apparatus, namely, optical lenses, telescopes, binoculars, microscopes and stereoscopes; telecommunication equipment, namely, videophones, intercoms, automatic telephone switching machines, manual telephone switching machines, telephones, telephone answering machines, portable telephones, transceivers, teleprinters, teletypewriters, automatic telegraphs, phototelegraphy machines, manual telegraphs, repeating exchange machines, facsimile machines, audio receivers, video receivers, television sets, radios, radios incorporating clocks, portable radio communication machines, navigation apparatus for vehicles in the nature of on-board computers, compact disc recorders, hard disk recorders, DVD players, DVD recorders, MP3 players, MP3 recorders, audio tape recorders, audio cassette players, phonograph record players, video disc players, video tape recorders, loudspeakers, radio pagers, microphones and headphones; electronic machines, instruments and parts, namely, magnetic prospecting machines, magnetic object detectors, echo sounders, ultrasonic flaw detectors, ultrasonic sensors, electron microscopes, electronic desk calculators, word processors, bar code readers, scanners, electronic personal organizers, electronic typewriters, electronic pens, central processing units (CPU's), computers, notebook computers, laptop computers, computer memories, computer monitors, computer disc drives, tape units for computers, computer printers, computer keyboards, plotters, computer mouse, personal digital assistants (PDA's), portable electronic calculators, portable electronic translators, electron tubes, semiconductor devices, and printed electronic circuits and video game machines for use with televisions