Optical apparatus and instruments, namely, optical strain gauges, interferometers, prisms, optical flats, optical mirrors, beam splitters, optical windows, retroflectors, beam expanders and laser amplifier optics and optical glasses; measuring instruments, namely, laser distance meters; lasers, not for medical purposes; optical lenses; photometers; optical goods, namely, optical glasses bracket, optical frames and optical vibration isolation platform; teaching apparatus, namely, teaching robots