People on eBay are selling these Soviet pocket-watch style rotary slide rules: https://www.youtube.com/watch?v=Kuzdjy3HpWg https://www.youtube.com/watch?v=Kuzd

People on eBay are selling these Soviet pocket-watch style rotary slide rules: https://www.youtube.com/watch?v=Kuzdjy3HpWg https://www.youtube.com/watch?v=Kuzdjy3HpWg I think they were made into the 80s.