ZUAN SHI YAN

Breathing apparatus for underwater swimming; Close-up lenses; Electronic collars to train animals; Eyeglasses; Filters for ultraviolet rays, for photography; Flashlights for use in photography; Global positioning system receivers; Goggles for sports; Microscopes; Optical lenses; Pince-nez; Prisms for optics purposes; Protective helmets for sports; Telescopes; Viewfinders, photographic; Wearable activity trackers