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https://little-histories.org/2015/11/08/%d0%b0%d1%80%d0%b8%d1%84%d0%bc%d0%be%d0%bc%d0%b5%d1%82%d1%80-%d1%84%d0%b5%d0%bb%d0%b8%d0%ba%d1%81-1960-%d0%b5-%d0%b3%d0%be%d0%b4%d1%8b/
Арифмометр «Феликс», 1960-е годы