Automatic dispensers powered by battery and having a replaceable canister containing an insecticidal chemical agent and also having a spray head for periodically spraying such agent into the atmosphere, the chemical agent being for purifying the air from non-visible or visible bugs

'agent':15,26,32 'air':37 'also':17 'atmospher':29 'automat':1 'batteri':5 'bug':44 'canist':10 'chemic':14,31 'contain':11 'dispens':2 'head':21 'insecticid':13 'non':40 'non-vis':39 'period':23 'power':3 'purifi':35 'replac':9 'spray':20,24 'visibl':41,43

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