9 Testing other than medical testing, scientific, nautical, optical, weighing, measuring, signaling, checking and supervising, machines, and instruments, namely, engine and chassis dynamometer and transmission test equipment comprised of a dynamometer, engine mounting stands, drive shafts, guards, fuel, oil, water and air cooling modules and cooling fans all sold as a unit and structural replacement parts thereof, fuel consumption measurement systems, namely, electrical and electronic measuring instruments for use in measuring fuel consumption for automotive, aerospace, industrial and marine use; exhaust gas measurement systems, namely, electrical and electronic measuring instruments for use in measuring engine exhaust gas emissions, for automotive, aerospace, industrial and marine use; electrical and electronic machines apparatus and instruments for testing, namely, electrical controller, electrical controlling devices, electronic controls systems for machines, for use with all the aforesaid machines, apparatus or instruments; electrical and electronic control apparatus and instruments, all for use with all the aforesaid machines, apparatus or instruments, namely, electrical controllers, electrical controlling devices, electronic controls systems for machines; apparatus for recording, transmission and reproduction of sound or images; blank magnetic data carriers, prerecorded magnetic data carriers featuring digital control and data acquisition information for industrial turbines, industrial engines, marine engines, vehicle engines and transmission and chassis dynamometers; recording discs, namely, compact discs featuring digital control and data acquisition information for industrial turbines, industrial engines, marine engines, vehicle engines, and transmission and chassis dynamometers; computer hardware and firmware for digital control and data acquisition information for industrial turbines, industrial engines, marine engines, vehicle engines, and transmission and chassis dynamometers; data processing apparatus, computer software for digital control and data acquisition information for industrial turbines, industrial engines, marine engines, vehicle engines, and transmission and chassis dynamometers; computer programs for digital control and data acquisition information for industrial turbines, industrial engines, marine engines, vehicle engines, and transmission and chassis dynamometers; computer memories