A YALONG

Downloadable electronic publications in the nature of books in the field of physics; teaching apparatus, namely, teaching robots; apparatus and instruments for physics, namely, prisms for scientific purposes; furniture especially made for laboratories; demonstrating instruments for physics, namely, prisms for scientific purposes; frequency meters; high-frequency apparatus, namely, high frequency switches; set of electric checking and testing apparatus, namely, technical measuring, testing and checking apparatus and instruments for measuring, testing and checking the temperature, pressure, quantity and concentration of gas and liquids; epidiascopes; computers; vibration meters; automatic depth gauge; spirit measures; integrated circuits; photographic slides; signal lanterns, namely, optical lanterns; power distribution or control machines and apparatus for power station, namely, electrical power distribution units; teaching projection lamp, namely, overhead projectors