LABORATORY EQUIPMENT, APPARATUS AND INSTRUMENTS AND PARTS THEREOF, FOR USE IN FILTRATION, FERMENTATION, CONCENTRATION AND SEPARATION OF MATERIALS AND FOR CULTIVATING AND SEPARATING CELLS AND ENZYMES; LABORATORY CENTRIFUGES, CONTINUOUS-OPERATION LABORATORY CENTRIFUGES, LABORATORY FILTERS, FILTER MEMBRANES, MOLECULAR FILTERS, SCREENS FOR FILTERS, SCALES; LABORATORY GLASSWARE; NAMELY, CULTIVATION VESSELS AND CONTAINERS; SPEED CONTROLS; TEMPERATURE CONTROLS AND PARTS THEREOF; COMPUTER KEYPADS AND...