Aerometers; Ammeters; Binoculars; Electronic collars to train animals; Fuse wire; Galvanometers; Hourglasses; Hygrometers; Magnifying glasses; Micrometer gauges; Micrometer screws; Microscopes; Mouse pads; Optical glasses; Optical lenses; Optical readers; Periscopes; Precision balances; Prisms for optics purposes; Projection screens for movie films; Protective eye pieces; Protective films adapted for computer screens; Scales; Scientific and technical apparatus, namely, optical mirrors; Slide ...