Cold air guns, namely, spot cooling apparatus for use in industrial fabrication, assembly and packaging; air conveying system equipment, namely, vortex tubes, air flow amplifiers, blow gun nozzles blowers; compressed-air spraying machines for spraying water or oils; compressed-air operated sprayers; all the aforementioned goods are not for use in anti-pollution equipment and heat exchangers

Air cooling device, comprising vortex tubes, air flow amplifiers, blow gun nozzles for use in blowing off sawdust and not for use in anti-pollution equipment and heat exchangers