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![Vintage Soviet LED Calculator "Elektronika MK-42", USSR, 1980s, 5W, 220V | eBay](https://i.ebayimg.com/images/g/nkEAAOSwOU1gcxjl/s-l1600.jpg "Vintage Soviet LED Calculator "Elektronika MK-42", USSR, 1980s, 5W, 220V | eBay")