Abacuses; Locks, electric; Apparatus and instruments for physics namely, test weights, prisms for scientific purposes, ammeters, barometers and spectroscopes; Chemistry apparatus and laboratory instruments namely, 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 natur...