Abacuses; locks, electric; physical and chemical laboratory apparatus and instruments, namely, test weights, prisms for scientific purposes, ammeters, barometers and spectroscopes, laboratory chemical reactors, plates, glass slides, pipettors, dispensors, mixers, thermostats, and laboratory glassware; optical apparatus and instruments except for glasses and photographic apparatus, namely, optical inspection apparatus, optical measurement apparatus in the nature of tachometers, optical communi...