Amplifiers; Binoculars; Loudspeakers; Microscopes; Telescopes; Audiovisual receivers; Lens hoods; Magnifying glasses; Microscopes and parts thereof; Optical inspection apparatus; Teaching apparatus in the nature of a guard that is attached to the body of a woodwind instrument for music instruction; Teaching apparatus in the nature of hairdressing training heads; Video telephones; Artificial limbs for medical instruction purposes; Laboratory equipment, namely, microscope slides; Magnifying pee...