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LABORATORY EQUIPMENT FOR MEASURING AND CONTROLLING PRESSURE AND RATE OF FLOW OF LIQUIDS AND GASES IN CONDUITS-NAMELY, FLOW METERS, VISCOSITY METERS, FINGER AND MOTOR ACTUATED LIQUID DISPENSERS; PIPETTE FILLERS; LIQUID AND GAS PUMPS-NAMELY, VARISTALTIC PUMPS, MINISTALTIC PUMPS, FLEX-I-LINER PUMPS, MACROSTALTIC PUMPS; DILUTING AND PIPETTING DEVICES; FITTINGS FOR MAKING CONNECTIONS IN GLASS TUBING, AND PARTS FOR ALL OF THE ABOVE