9 scientific, measuring, signal, control and regulating apparatus and instruments, namely, mass-flowmeters, gas sensors, analyzers, recorders, printers, processors, displays, measurement amplifiers, gas regulators; temperature measuring instruments and equipment, namely, sensors, analyzers, recorders, printers, displays and replacement parts thereof; thermo couples for use in measuring temperatures; gas measuring instruments and equipment, namely, gas sensors; natural gas sensors for detecting gas leaks in industrial furnaces; measuring amplifiers; and parts for all the aforesaid goods