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Scientist and inventor Alexei Emelyanov was forced to master the epistolary genre. He appeals to the Soviet authorities with a proposal to introduce a device that can radically improve the ecology of large cities. Today, this dream becomes a reality thanks to his unique invention - an ozonator that cleans the air of exhaust gases and harmful substances. In the USSR, it seems that Emelyanov is not noticed, and in Japan and the United States, they wait, offer a laboratory and pilot production. What decision will a scientist make?
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